Christian Pulisic admitted to being "very frustrated" at being left out of Chelsea's starting line-up for Wednesday's Champions League semi-final second leg with Real Madrid.

The United States international scored a crucial away goal for the Blues in last week's first leg but was named among the substitutes for the return fixture at Stamford Bridge.

He again made his impact known, however, by setting up a goal for Mason Mount 18 minutes after being introduced from the bench in the 2-0 win, which saw Chelsea through 3-1 on aggregate.

"I'm very frustrated," Pulisic, who has struggled with injuries this term, told CBS Sports. "There's not much else to say. I wanted to play from the beginning, as I always do.

"I've had to continue to prove myself over and over again. But, as always I reach out to God and he gives me strength. With that behind me, nothing can stop me really."

A look at the Opta stats shows Pulisic has a right to be frustrated, having now scored and assisted a combined four goals in the Champions League in nine appearances this term.

Only Olivier Giroud and Timo Werner have been directly involved in more (both six) - in eight and 11 games respectively.

For comparison, Mount - who has been superb for Chelsea this season - has three direct goal involvements in 10 Champions League games, while Kai Havertz has two from 11 respectively.

Focusing on the Premier League, meanwhile, Pulisic has four goals and one assist in 23 appearances this term, just 14 of those being starts.

Pulisic's average of a 0.26 goals per 90 minutes is slightly better than Havertz's return of 0.25 and behind only Giroud (0.5) and Tammy Abraham (0.52) among Chelsea's attackers. Werner, for context, averages 0.23.

The 22-year-old also performs better when it comes to chances created per 90 minutes in the English top flight when compared to Havertz - 1.37 to the German's 1.07.

But Pulisic still ranks some way below Hakim Ziyech, who has created 2.54 chances per 90 minutes this season and will also perhaps feel that he should be starting more often.

Mount (2.68) and Callum Hudson-Odoi (2.71) lead that particular metric, incidentally, which only highlights just how many options Thomas Tuchel has available in that zone.

One area Pulisic struggles in comparison to his attacking rivals is passing accuracy in the opposition half - 80.95, which is lower than Havertz's 84.3, Mount's 85.45 and Hudson-Odoi's 85.65. ​

The American's win rate when starting games also does not make for good reading.

The Blues have won 13 and lost just two of the 20 league games Pulisic has not featured from the beginning this term, compared to four wins and five losses in the 14 games he has been included in the XI.

Chelsea average 1.8 league goals with Pulisic in their starting line-up, as opposed to 1.3 without, while their average goals against rises from 0.6 to 1.4 when he starts.

Tuchel ultimately knows best when it comes to his team selection - and he is backed up by the possibility of a Champions League and FA Cup double - so Pulisic will simply have to keep proving himself if he is to hold down a regular starting spot.

Worried about football's global appeal to the younger generation? Fearful the Champions League has lost its lustre beyond the core of 'legacy' (urgh!) fans in its traditional markets?

Perhaps what you need is a dazzlingly skilful 22-year-old becoming the first player from the United States to score in the semi-finals of Europe's top competition, while generally wreaking havoc every time he has the ball.

Florentino Perez must have loved Christian Pulisic taking his Real Madrid apart. The Chelsea forward made the 13-time winners of the competition Perez sought to torpedo last week look more non-league than Super League.

Pulisic was at the heart of an utterly dominant opening for Chelsea – themselves foolhardy signatories to the not-so-brave new world last week – nodding down for his beleaguered attacking colleague Timo Werner to volley too close to Thibaut Courtois between the Madrid posts.

Shortly afterwards, Pulisic took matters into his own hands, darting across a static Los Blancos backline to collect Antonio Rudiger's raking pass. His first touch was poor, but everything else from that point was perfection.

Madrid's defenders scattered and then cowered towards their goalmouth. Werner found himself demoted from strike partner to spectator at The Christian Pulisic Show. The American rounded Courtois and took aim high into the net.

Just after that, Nacho should have been booked for bringing down the goalscorer, with Eder Militao having also escaped censure for clobbering through the same player. Pulisic was everywhere.

If Perez was worried about addled young minds missing all this, no problem. It all happened inside the first 15 minutes. Plenty of time to watch, absorb, enjoy and then stick Fortnite on.

Amid his compilation of violent brain vomits last week, Perez suggested football matches should be shorter to appeal to fans more than 50 years his junior – a demographic with whom he appears to feel he is completely in tune.

Of course, it's an awful idea. And it is hard to think of many teams who would suffer more in a world of fast food football than the aging Real Madrid team he no longer has the bank balance to reupholster.

Zinedine Zidane opted to match Chelsea's shape, only to find a reinforced five-man backline somehow riddled with holes as Pulisic and Werner made merry early on.

Much is made of the esteemed midfield trio of Casemiro, Toni Kroos and Luka Modric having a combined age of 95. As N'Golo Kante jackhammered around them, each one of them looked about 95.

Collectively, they needed 20 minutes or so to click into gear. Even then, they negotiated the rain-lashed terrain of Valdebebas tentatively.

The one exception was Karim Benzema, Madrid's talismanic centre-forward who nodded and licked his lips with menace during the pre-game anthem, before basically playing Chelsea on his own for a good while.

At a time when Madrid's superstars have moved on from either the club or their peak playing days, Benzema stands tall week after week.

Against the run of play, he had his 71st Champions League goal, drawing level with Madrid great Raul in fourth on the all-time list. Inside a crowded penalty area, he controlled the ball with his forehead before swivelling to detonate an unstoppable volley.

Benzema's goal was one that beautifully combined the cerebral and the visceral and would have been at home in any of Madrid's previous great eras in this competition, eras that are connected to the present by such moments of brilliance.

Goals like Benzema's shimmer brighter through their link to past context. A great Real Madrid goal in a European Cup semi-final really means something.

From that moment, Chelsea's more nimble operators became engaged in an arm wrestle that was more to Madrid's liking. Even when Thomas Tuchel introduced Kai Havertz, Reece James and Hakim Ziyech in a triple change after the hour, the hosts remained upright on weary limbs.

Having seen his team be so inept in the initial exchanges, Zidane was able to play with Chelsea's tensions and emotions by sending on Eden Hazard.

It remained 1-1, a result most teams would be delighted to take into a home second leg. But Madrid do funny things in this tournament. They defy logic to find reserves that should have long run dry. They are propelled by purpose and history.

Above all the others, simply wanting to take his team away from the Champions League might have been Florentino Perez's most stupid idea of all.

The United States sealed a fifth consecutive win in all competitions as goals from Giovanni Reyna and Christian Pulisic secured a 2-1 friendly win over Northern Ireland. 

In the first-ever meeting between the two nations, USA went ahead after 30 minutes when Borussia Dortmund midfielder Reyna sent a deflected effort past Conor Hazard. 

That was Reyna's second goal in four appearances for his country, with his strike making him the youngest player to score an away goal for USA (18 years and 135 days) since Pulisic against Saint Vincent and the Grenadines in September 2016 (17 years and 350 days).

Pulisic doubled the visitors' advantage in the 59th minute, stroking home from the penalty spot after he had been brought down inside the area by Daniel Ballard. That was the Chelsea man's eighth goal involvement in his last 10 appearances for his country (five goals, three assists). 

Substitute Niall McGinn pulled one back for Northern Ireland in the 88th minute but it proved too little, too late for Ian Baraclough's side, who are winless in their last 12 matches across all competitions.

Ronald Koeman only took charge of Barcelona at the start of the season, but his tenure could be brief.

With Joan Laporta back at Camp Nou as president, he is determined to make his mark.

And highly rated RB Leipzig head coach Julian Nagelsmann is reportedly fancied in Barcelona.

TOP STORY – LAPORTA FANCIES NAGELSMANN

New Barcelona president Joan Laporta is eyeing RB Leipzig's Julian Nagelsmann as the club's next head coach, according to El Larguero.

Laporta was elected Barca president on Sunday and attention has immediately turned to the dugout at Camp Nou.

Ronald Koeman is currently at the helm but while Laporta respects the Dutchman, he prefers Nagelsmann.

ROUND-UP

- Paris Saint-Germain could make a move for Juventus superstar Cristiano Ronaldo if Kylian Mbappe leaves, claims Le Parisien. Reports in Italy and Spain say Juve will sell Ronaldo at the end of the season following their Champions League last-16 exit. With Mbappe's future unclear in Paris amid links to Real Madrid, PSG are eyeing a possible deal for Ronaldo. Barca's Lionel Messi has also been heavily linked.

- The Daily Mail reports Chelsea are keen on Bayern Munich's Kingsley Coman if Christian Pulisic leaves Stamford Bridge. Liverpool, Manchester United and Bayern have emerged as possible suitors for Pulisic, who is out of favour under Chelsea manager Thomas Tuchel. Coman was linked with United during the previous transfer window.

- Barca are dreaming of signing Borussia Dortmund sensation Erling Haaland, claims Mundo Deportivo. Madrid, PSG, United, Chelsea, Liverpool, Juventus and Manchester City are all reportedly keen on Haaland. City forward Sergio Aguero, Lyon captain Memphis Depay, Bayern star David Alaba and City defender Eric Garcia are also among Barca's list of targets.

- Liverpool midfielder Georginio Wijnaldum is a target for Inter, according to Calciomercato. The Netherlands international has been linked with Barca previously.

- Ajax's Brian Brobbey will join Leipzig on a free transfer at the end of the season, reports Fabrizio Romano.

Gianluigi Donnarumma is out of contract at the end of the season, so where will he be playing in 2021-22?

The Milan and Italy goalkeeper – still in discussions with the Rossoneri – has attracted interest from across Europe.

Manchester United and Chelsea are reportedly circling.

TOP STORY – DONNARUMMA WANTED IN ENGLAND

Manchester United and Chelsea are considering signing Milan star Gianluigi Donnarumma as a free agent, according to The Transfer Window podcast.

Donnarumma is out of contract at the end of the season, though Tuttosport reports he and Milan remain in contract discussions.

Serie A champions Juventus and Ligue 1 titleholders Paris Saint-Germain have also been linked.

Sky Sports says United are also targeting Atletico Madrid's Jan Oblak amid doubts over David de Gea's future.

ROUND-UP

- The Daily Mail claims United, Liverpool and Bayern Munich are eyeing Chelsea's Christian Pulisic. The United States international has found himself out of favour under new manager Thomas Tuchel at Stamford Bridge.

- The wish list of new Barcelona president Joan Laporta has been revealed. Sport reports aside from Manchester City defender Eric Garcia and Lyon captain Memphis Depay, Laporta is also targeting Sergio Aguero and Bayern star David Alaba, as well as in-demand Borussia Dortmund sensation Erling Haaland.

- Arsenal want to sign Inter full-back Achraf Hakimi as a replacement for Hector Bellerin, according to the Telegraph. Bellerin has been linked to PSG and Barca.

- Sport Bild reports Bundesliga champions Bayern will let veteran defender Jerome Boateng leave amid his links with Chelsea.

Sergio Aguero is being targeted by four European giants, while Bayern Munich are looking at Christian Pulisic.

Aguero, 32, is out of contract with Manchester City at the end of the season and his future is uncertain.

The forward has only played nine games this season, but he is still wanted by several European clubs.

TOP STORY – BARCELONA, JUVENTUS CHASE AGUERO

Barcelona, Juventus, Paris Saint-Germain and Inter are interested in signing Aguero, according to the Mirror.

Aguero has been at City since 2011 and is the club's all-time leading goalscorer.

The Argentina international has struggled with injury and coronavirus this season.

ROUND-UP

- Another player who has battled injuries this season is Pulisic. Todofichajes.com reports Bayern Munich have contacted Chelsea about a possible move for the former Borussia Dortmund star.

- Juventus want to keep Alvaro Morata. Goal reports the Serie A side are keen to extend the forward's loan for another season and are prepared to pay Atletico Madrid €10million.

- Barcelona seem set to sign a forward ahead of next season. ESPN reports the LaLiga giants have intensified their interest in Real Sociedad striker Alexander Isak.

- Struggling for game time at Manchester United, Dean Henderson could make a move. Chelsea, Tottenham and West Ham are interested in the goalkeeper, according to the Manchester Evening News.

- Hector Bellerin may leave Arsenal. CBS Sports reports the full-back is eager to test himself away from the Premier League club and Paris Saint-Germain are ready to revive their interest.

Two of the Bundesliga's brightest young stars were on target on Saturday and made history in the process.

Florian Wirtz struck for Bayer Leverkusen in their 5-2 defeat of Stuttgart, while Youssoufa Moukoko scored for Borussia Dortmund in a 2-1 loss at Freiburg.

Wirtz netted Leverkusen's fourth goal in a win that took them fourth, with debutant Demarai Gray adding the fifth.

It was Wirtz's fifth Bundesliga goal and at 17 years, nine months and three days he became the youngest ever player to that mark.

Indeed, no player in Germany's top flight has previously reached five league goals before their 18th birthday.

Wirtz became the youngest scorer in Bundesliga history when he got up and running with a goal against Bayern Munich late last season, then 17 years and 34 days.

But that record was subsequently taken by Moukoko in December, the Dortmund forward 16 years and 28 days old when he hit the net in a 2-1 defeat to Union Berlin.

Moukoko had not scored again until Saturday when another loss by the same scoreline at Freiburg included a consolation strike after replacing Marco Reus on the hour mark.

He consequently became the youngest player to score two Bundesliga goals, getting there when 505 days younger than former record holder Christian Pulisic.