David Trezeguet believes "world-class" Adrien Rabiot can be an "important player" for Juventus with the midfielder's future uncertain.

Rabiot has just returned from an impressive World Cup, where he helped France reach a final they lost to Argentina on penalties at Lusail Stadium last Sunday.

There are reports that Juve could sell the midfielder in January to avoid him departing on a free transfer when his existing contract expires at the end of the season.

Former Juve and France striker Trezeguet feels the ball is in his former club's court.

"[With Rabiot] we are talking about a problem for Juventus because in Italy, he may have been targeted for criticism, but in France, it's completely different," he told Sky Sport Italia.

"He is world class, an extraordinary player. Now, he will evaluate his options and will go back to being the important player he always was.

"Juve will have to be a protagonist, that is what their history commands, and the players shouldn't worry about what is happening off the field.

"They'll have [Angel] di Maria back and fired up as a world champion with Argentina, while [Paul] Pogba and many others can give something extra."

Trezeguet also gave his thoughts on former team-mate Didier Deschamps, whose future as France head coach is uncertain with Zinedine Zidane reportedly a potential replacement.

"Didier has a very good rapport with the president of the federation, so he will take his time and come to a decision," said Trezeguet, who won the 1998 World Cup and Euro 2000 alongside Deschamps.

"If he decides to leave, then he'll see what to do in future."

David Trezeguet admits Sunday's World Cup final will be "difficult personally" as the France World Cup winner with Argentine roots finds himself pulling for Lionel Messi.

Former Juventus star Trezeguet is torn by his loyalties to each country, but his feeling is that Messi deserves to be a World Cup winner and needs this more than Kylian Mbappe.

The Paris Saint-Germain team-mates are shaping to be the principal players in the Lusail Stadium drama that will unfold, with 35-year-old Messi seeking his first triumph at this level while 23-year-old Mbappe chases his second winner's medal.

Trezeguet was a champion with Les Bleus in 1998, having elected to play for France, where he was born, over Argentina, from where his parents hailed.

Looking at the position Messi finds himself in, Trezeguet told TyC Sports "I repeat it continuously, for me emotionally, knowing that it will be his last World Cup, Leo deserves to be champion.

"He makes people dream, this does not take away from France's ambition to want to keep the title.

"France came to be world champion, there is no doubt. Here the difference is age, Leo is at the end of his career, Mbappe has just started and will set all kinds of records.

"Together at PSG they are the perfect combination, but Argentina plays for Messi, everything goes through him.

"It's difficult personally, emotionally. Something I didn't want, but hey, this has to be a party and it's a great final. 

"It is what we all expected, due to characteristics, history, they are the two best teams in the World Cup."

Trezeguet could be overtaken by Mbappe on the list of France's all-time highest goalscorers on Sunday.

Presently, Mbappe has 33 goals for his country from 65 games, one shy of Trezeguet's career haul of 34 in 71 international matches.

While Trezeguet will be able to celebrate either victory, there will be broken-hearted players on one side come the end of the final.

His admiration for Mbappe is fulsome, and Trezeguet believes the forward and his bullish ways only bode well for his long-term prospects.

"He has a healthy ambition, he wants to be better than Messi, that's his motivation," Trezeguet said. "Living in everyday life with Leo and Neymar [at PSG] makes him learn."

France's all-time top goalscorer Olivier Giroud is the most complete striker at the World Cup, according to Les Bleus legend David Trezeguet.

Giroud surpassed Thierry Henry's tally of 51 France goals as Didier Deschamps' men beat Poland in the last 16 in Qatar, teeing up Saturday's quarter-final clash with England.

The 36-year-old Milan striker has scored three goals at the tournament. Only one player has ever scored more goals at a single World Cup when aged 36 or older – Roger Milla in 1990 (four).  

Speaking to RMC Sport ahead of France's meeting with the Three Lions, Trezeguet – who sits sixth in his country's scoring charts with 34 goals – said there was a lack of genuine strikers on display in Qatar.

"Olivier Giroud is the centre-forward as in my time. There really aren't any more," he said.

"Germany have suffered a lot without a centre-forward, the Netherlands and others have a clear idea without a centre-forward. 

"It is difficult to explain. We saw Spain, who lacked efficiency, either there was [Alvaro] Morata or there was nothing. 

"There is beauty, the technical side but you have to finish the job and Giroud seems to me to be the most complete in this competition."

Meanwhile, Trezeguet is confident France can become the first nation to retain the World Cup since Brazil in 1962, hailing Deschamps' management of the side.

"The French team has a clear idea, it is going very well with Giroud doing an exceptional job up front, [Adrien] Rabiot at a very high level, [Theo] Hernandez has been a huge solution," he said.

"There are details, but I think it's the most complete team. Deschamps has always been clear, the team plays on his qualities."

However, the 1998 World Cup winner knows England will offer a stern challenge in the last eight, as he lauded their development under Gareth Southgate.

"Gareth Southgate, I had the chance to know him at FIFA level. He is not a classic English coach, he is much more disciplined on the tactical side," he said.

"Over time this team has progressed. This team has everything to compete with the France team."

Juventus legend David Trezeguet says nobody has been able to manage Cristiano Ronaldo in the same way as former Real Madrid boss Zinedine Zidane.

Five-time Ballon d'Or winner Ronaldo has spent the past three seasons at the Allianz Stadium after joining from Real Madrid in a €112million (£99.2m) deal.

The 36-year-old, who has another 12 months to run on his contract, is coming off the back of a campaign that saw him finish top of the Serie A scoring charts with 29 goals.

He has scored 81 times in 97 Serie A games since arriving in July 2018, a tally bettered only by Robert Lewandowski (93 goals in 97 Bundesliga games) and Lionel Messi (91 goals in 102 LaLiga games) in Europe's top five leagues.

That compares to 311 goals in 292 LaLiga appearances during his nine seasons with Madrid, during which time he won 15 trophies, including four Champions League crowns.

Ronaldo spent two seasons playing under Zidane at the Santiago Bernabeu, and Trezeguet does not believe Massimiliano Allegri, Maurizio Sarri and Andrea Pirlo have got the most out of the Portuguese in the same way as Zidane.

"I think nobody has been able to manage him as Zinedine Zidane. Perhaps there has been a lack of dialogue at Juventus at some point," he told La Gazzetta dello Sport. 

"One coach can tell a player: 'Look at this game, you walked for 90 minutes and you must help me win the games'.

"There are players you don't want to play against because they make you win the matches. Ronaldo is one of them, [Paulo] Dybala as well. Some of the others, with all due respect, not as much."

Doubts remain over Ronaldo's future in Turin amid recent links with former clubs Madrid and Manchester United, as well as French giants Paris Saint-Germain.

Newly-appointed Juventus director Federico Cherubini this week insisted the superstar forward has not asked to leave the club, however, and he now looks set to remain for at least another season.

"Ronaldo was the best signing from Juventus, one that nobody expected," Trezeguet added. 

"There have been some problems with his team-mates, and you could see that, but he's scored 100 goals since joining."

Despite having Ronaldo on board, Juventus failed to win the Scudetto last season for the first time in a decade and only just finished in a Champions League qualification spot.

Allegri was reappointed last month following the departure of Pirlo, but Trezeguet would have preferred to see a different coach on the bench next season.

"The problem for me is the mentality," said Juve's fourth all-time record goalscorer. "The world of football no longer thinks Italian football is good. In Italy we defend low and ask more of the attacker.

"Abroad, everyone plays constantly at full speed. I am in favour of radical changes. If not Allegri, I would have gone for a foreign coach. But I understand greats like [Pep] Guardiola and [Jurgen] Klopp cost money."