Theo Hernandez could miss the start of the Serie A season after AC Milan announced a scan on his right ankle revealed a capsule ligament injury.

The 21-year-old left-back was taken off on a stretcher in the first half of Milan's 1-0 defeat to Bayern Munich in the International Champions Cup on Tuesday.

An examination on Saturday revealed Theo, who joined in a reported €20million switch from Real Madrid, will be sidelined for at least a fortnight, after which further tests will be conducted.

The new Serie A season kicks off in four weeks, with Milan hoping to improve on their fifth-place finish in 2018-19.

Leon Goretzka scored the only goal of the match as Marco Giampaolo's first game in charge of AC Milan resulted in a 1-0 loss to Bayern Munich at the International Champions Cup.

Giampaolo arrived from Serie A rivals Sampdoria after Gennaro Gattuso stepped down as head coach of Milan at the end of the 2018-19 season.

And Giampaolo oversaw defeat in Milan's pre-season opener as Goretzka's well-taken 48th-minute goal guided Bayern to their second ICC victory.

New signing Theo Hernandez made his debut for Milan following his transfer from Real Madrid, while Paolo Maldini's son – Daniel – was also in the starting XI for the Rossoneri.

Niko Kovac's Bayern controlled proceedings in Kansas City, where clear-cut chances were few and far between in a tight opening 45 minutes.

Maldini's side-footed effort sailed just over the crossbar, while Bayern midfielder Renato Sanches fired a powerful strike just past the post.

Hernandez's bow ended prior to half-time as the French full-back was carried off on a stretcher with an ankle injury.

Bayern managed to break the deadlock right on the stroke of half-time when Joshua Kimmich played a perfectly weighed pass to Goretzka, who took a touch before tucking the ball beyond Gianluigi Donnarumma in the 48th minute.

Patrick Cutrone – who has been linked to Premier League side Wolves – should have equalised for Milan after cutting out Niklas Sule's pass across goal but the second-half substitute was denied by Sven Ulreich in a one-on-one situation with 26 minutes remaining.

Bayern found the back of the net nine minutes from the end but Jann-Fiete Arp's goal was ruled out for what appeared to be a handball, while David Alaba had an effort cancelled out for offside.

Paolo Maldini insists AC Milan did not make an offer for Luka Modric this close season, although he admits the Real Madrid man would be "perfect" at San Siro.

Modric is expected to stay at Madrid, where he has been since 2012, but the 33-year-old was linked with moves to Inter last year and rivals Milan in recent months.

Maldini, acknowleding the midfielder's blend of experience and talent, says there was never any negotiation for the 2018 Ballon d'Or winner.

"We never negotiated for Modric, but we've said to [coach Marco] Giampaolo this club are looking for good young players and some experienced ones," Rossoneri technical director Maldini told a news conference.

"The growth of young players takes place through the presence of experienced players. Modric would be perfect here, but we've never negotiated for him."

Maldini was speaking alongside Rade Krunic and Theo Hernandez as they were presented as Milan players on Friday.

Hernandez, a left-back just as Maldini was in his playing days, was delighted to have joined Milan.

"It is a real honour to be sitting next to [Maldini]," Hernandez said. "He will always be the best full-back in the world.

"We met in Ibiza, where he had some very beautiful and sincere words for me. Since then, I have had the desire to join Milan. I trained hard to succeed and in the end I did it."

Theo Hernandez hopes to bring an end to AC Milan's 12-year wait for European glory by adding a second Champions League winners' medal to his collection following his move to San Siro.

After Real Madrid signed defenders Eder Militao and Ferland Mendy, 21-year-old left-back Theo opted to make a €20million switch to Milan, bringing an end to his two-year spell with Los Blancos.

Theo cost Zinedine Zidane's team €30m when he arrived from cross-city rivals Atletico Madrid in July 2017, but he made just 13 LaLiga appearances for the Santiago Bernabeu club.

He also played three times for Real Madrid in the Champions League, helping the club to win the competition in 2017-18, and he told Milan's official website he hopes for more success in Europe with the Rossoneri.

"I'm really excited and happy to be joining AC Milan," said Theo. "I hope I can make history with this club.

"I'll give my very best for this club. AC Milan is a great club – that is why I have come here, to reach the very top and win the Champions League with the Rossoneri.

"I would like to tell you [the fans] that I'm here to make history and do my very best for you all.

"I'm delighted to be here. Forza Milan!"

Theo Hernandez has completed a transfer from Real Madrid to AC Milan.

Milan have paid a reported €20million for the 21-year-old, who has signed what is believed to be a five-year contract at San Siro.

Theo joined Los Blancos on a six-year deal from city rivals Atletico Madrid in 2017 but made just 23 appearances in his maiden season at Madrid, before joining Real Sociedad on loan for 2018-19.

With Madrid having signed left-back Ferland Mendy from Lyon, Theo – whose brother Lucas left Atleti to join Bayern Munich on July 1 – has been deemed surplus to requirements.

Following Theo to Milan could be Empoli midfielder Rade Krunic, while Arsenal's Lucas Torreira was reportedly the subject of a loan offer from the Rossoneri.

Atletico Madrid have agreed a deal to bring Marcos Llorente to the Wanda Metropolitano in a reported €40million move from Real Madrid.

Llorente made just seven LaLiga appearances last season and will hope for more opportunities with Atleti, where he appears set to replace Manchester City target Rodri.

Incredibly, Llorente is following in the footsteps of his father, Paco, and his grandfather, Ramon Grosso, who also represented both of the capital's biggest clubs.

They are not the only players to turn out for the two teams, though. Here are six of the best players to have featured for Atleti and Madrid...

Thibaut Courtois

Courtois enjoyed a superb three-season loan spell at Atletico, helping them to end an 18-year wait for a LaLiga title and reach the Champions League final in 2014, having also won the Copa del Rey and Europa League. He was similarly successful upon returning to Chelsea, adding two Premier League titles, an FA Cup and the EFL Cup to his list of honours, but he has yet to hit those same heights at Madrid after leaving Stamford Bridge last year.

Theo Hernandez

Before older brother Lucas agreed to depart Atletico for Bayern Munich, Theo controversially left them for Madrid in 2017 having not played a professional game for Simeone's side. The left-back made 23 appearances in his debut season for Madrid, winning the Champions League, but was loaned to Real Sociedad for 2018-19.

Raul

Though he went on to secure a place as a legendary figure in Madrid's storied history, things could have been very different for Raul, who was in Atletico's academy until it was closed as a cost-saving measure. Madrid took advantage and got him on their books, and Raul went on to win six LaLiga titles and three Champions League trophies with the club, becoming their record goalscorer with 323 strikes to his name before eventually being displaced by Cristiano Ronaldo.

Alvaro Morata

Morata spent four seasons with Atleti as a youth player but made his breakthrough in senior football with bitter rivals Madrid, where he won eight trophies - either side of two seasons with Juventus - including two LaLiga crowns and two Champions Leagues. A lack of first-team football saw Morata on the move again in 2017, but he failed to settle after being made Chelsea's record signing and was sent back to boyhood club Atleti on loan in January. A steady start returned six goals in 17 appearances in all competitions.

Santiago Solari

Midfielder Solari made the move from River Plate to Atletico in 1999, but their relegation from LaLiga in 2000 led him to the Santiago Bernabeu, where he served as a workmanlike force for the 'Galacticos'. Solari won a pair of LaLiga titles and the 2001-02 Champions League, thanks to Zinedine Zidane's stunning volley against Bayer Leverkusen, but did not enjoy the same success as his former team-mate in the dugout, lasting less than five months in charge last season.

Bernd Schuster

Schuster evidently did not mind making controversial transfers. After great success at Barca, he moved to the other side of the Clasico rivalry and won two LaLiga titles and the Copa del Rey. The German midfielder and future Madrid coach went on to claim a further two Copas with Atletico following his 1990 move across the city.

Alvaro Morata has ended his difficult time at Chelsea by securing a move back to Spain with Atletico Madrid.

The striker has signed a deal that will see him spend the rest of this season and 2019-20 on loan with Diego Simeone's side, who are reported to have the option of a permanent transfer.

Morata spent four seasons with Atleti as a youth player but made his breakthrough in world football with bitter rivals Real Madrid, with whom he won eight trophies, including two LaLiga crowns and two Champions Leagues.

He is certainly not the first to represent both of the capital's big boys, though. Here are six of the best players to have turned out for Atleti and Madrid in their careers...

Thibaut Courtois

Courtois enjoyed a superb three-season loan spell at Atletico, helping them to end an 18-year wait for a LaLiga title and reach the Champions League final in 2014, having also won the Copa del Rey and Europa League. He was similarly successful upon returning to Chelsea, adding two Premier League titles, an FA Cup and the EFL Cup to his list of honours, but he has yet to hit those same heights at Madrid after leaving Stamford Bridge in August.

Theo Hernandez

Unlike older brother Lucas, who remains a key part of Atletico's team, Theo controversially left them for Madrid in 2017 having not played a professional game for Simeone's side. The left-back made 23 appearances in his debut season for Madrid, winning the Champions League, but was loaned to Real Sociedad for 2018-19.

Raul

Though he went on to secure a place as a legendary figure in Madrid's storied history, things could have been very different for Raul, who was in Atletico's academy until it was closed as a cost-saving measure. Madrid took advantage and got him on their books, and Raul went on to win six LaLiga titles and three Champions League trophies with the club, becoming their record goalscorer with 323 strikes to his name before eventually being displaced by Cristiano Ronaldo.

Jose Antonio Reyes

A disappointment at Arsenal, where he never seemed settled after moving from Sevilla, Reyes returned to Spain when he joined Madrid on loan in 2006 and wrote his name into club folklore by scoring twice on the final day of the season as they came from behind to beat Real Mallorca 3-1 and clinch the league title ahead of Barcelona. He subsequently made the move to Atletico for the following season, in which he failed to score a single goal. That led to him being loaned out to Benfica, but Reyes returned to help Atletico win the Europa League in 2010 and 2012.

Santiago Solari

Midfielder Solari made the move from River Plate to Atletico in 1999, but their relegation from LaLiga in 2000 led him to the Santiago Bernabeu, where he served as a workmanlike force for the 'Galacticos'. Solari won a pair of LaLiga titles and the 2002 Champions League, thanks to Zinedine Zidane's stunning volley, and will hope to have the same success his former team-mate enjoyed in the dugout, having taken over as Madrid head coach from Zidane's successor Julen Lopetegui.

Bernd Schuster

Schuster evidently did not mind making controversial transfers. After great success at Barca, he moved to the other side of the Clasico rivalry and won two LaLiga titles and the Copa del Rey. The German midfielder and future Madrid coach went on to claim a further two Copas with Atletico following his 1990 move across the city.

Theo Hernandez has prepared for his weekend showdown with Lionel Messi by telling the Barcelona superstar that Cristiano Ronaldo is the best player in the world. 

Real Madrid defender Theo Hernandez will continue his development at Real Sociedad after agreeing a season-long loan at Anoeta.

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