LOS ANGELES -- Jose Mourinho has said Matteo Darmian can leave Manchester United this summer despite confirming Antonio Valencia is likely to miss the start of the season through injury.

The Italian was named captain by Mourinho for the game against boyhood club AC Milan at the StubHub Center and United boss confirmed after a 9-8 win on penalties the full-back wants to leave.

"The captaincy because he is a fantastic guy in my two years and with Mr. Van Gaal before me, he is the kind of guy who is always ready to give what he has, he grew up in AC Milan and to play against his childhood club and be captain in a friendly has a nice meaning," Mourinho said.

"Matteo wants to leave and I think when a player wants to leave if the right offer arrives you have to try to be human and let the player follow his instinct."

Darmian has been linked with moves to Juventus and Inter Milan but Mourinho revealed the club were yet to receive an acceptable offer.

Valencia has flown from the U.S. with a calf injury and is set to miss the start of the Premier League season but Mourinho said Darmian, 28, can leave on the right terms.

Matteo Darmian captained Manchester United for their win over AC Milan on penalties. John Peters/Man Utd via Getty Images

"Until now the offers we got for Matteo are not even close to being accepted," Mourinho added.

"Valencia is injured, you are right, and he will be injured for the beginning of Premier League, Diogo Dalot is also in the recovery phase, he will not be ready for beginning of Premier League."

Mourinho says Ashley Young could switch to right-back for the start of the season with Luke Shaw on the left and appeared to ask the 33-year-old to return early from his holiday after England's run to the World Cup semifinals.

"Ashley Young, a possible to play right-back, is on holiday. I don't know if he fancies to be back for that and put himself to be available for the team or stay on holiday.

"Victor [Lindelof] is a possibility, he is not a right-back but is a possible. He starts training next Monday. I will send people to Manchester to train with Victor. It makes no sense for him to come to the U.S.

"So if Matteo leaves he leaves because the right offer arrives and if he stays, yes you are right, he can be important for us."