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.

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