United’s boss signed a new contract today but Telles’ career at Old Trafford has failed to get going
The Brazilian left-back sustained the problem during the club’s training camp in Surrey this week and has returned home, missing Saturday’s friendly with QPR.
“We’re hoping that it’s not going to be too bad but he’ll be out for a little while.”
Telles looks set to miss next week’s friendlies against Brentford and Preston, with another warm-up match against Everton on 7 August.
United kick-off their Premier League campaign against Leeds seven days later.