Manchester United and England defender Luke Shaw has a minor groin tear, a scan has revealed.
He will miss Wednesday's EFL Cup tie at Northampton and is 50-50 for Saturday's Premier League visit of Leicester.
Shaw, 21, played 85 minutes of Sunday's 3-1 defeat by Watford, after which he was criticised by boss Jose Mourinho.
He said Shaw, who returned last month after breaking his leg a year ago, was too far from Nordin Amrabat in the build-up to Watford's second goal.
Shaw has started all five of United's Premier League games so far.
The Red Devils have lost their past three matches.