Jose Mourinho's side were put through the paces in their second training session of the summer at UCLA's Drake Stadium on Tuesday morning, after arriving in Los Angeles on Sunday evening and holding a closed practice on Monday.
The Portuguese tactician is said to be a big admirer of Croatia worldwide Ivan Perisic, who scored a goal and assisted another strike in the final of the world showpiece in Russian Federation on Sunday.
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United have signed right back Diogo Dalot, Brazilian midfielder Fred and they are still looking to acquire the services of a new left back.
The 29-year-old signed a new long-term contract at the San Siro after his proposed move to Old Trafford broke down last summer and recently insisted that his focus remains on Inter.
Perisic has been a long-term target for Mourinho and the United boss praised the Inter Milan winger following his excellent performances in Russian Federation that saw Croatia reach their first ever World Cup final.
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"Three weeks [off], which I think is the minimum that their body and soul needs, and which is the minimum for the them to return and think about football again", Mourinho said in answer to how long the players would get as a break.
The 19-year-old joined the English giants in 2014 from Hutchison Vale Boys Club was an unused substitute in last season's FA Cup win at Huddersfield after French World Cup victor Paul Pogba fell ill.
Perisic was seen as the cheaper alternative to Real Madrid's Gareth Bale and it was understood that United couldn't come to an agreement with the Italian giant's about the transfer fee.
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