Arsenal midfielder Jack Wilshere could be sidelined for six to eight weeks through a hairline fracture to his right ankle.
Wilshere suffered the injury during training when he received a heavy tackle in training on Saturday ahead of the FA Community Shield.
Arsenal defeated Chelsea 1-0 in the Premier League curtain raiser, courtesy of an Alex Oxlade-Chamberlain strike.
The BBC Sport reports that England international will not require surgery to the small bone crack, but is expected to be laid off for around six to eight weeks.
Wilshere required two operations to his left ankle ligament and was sidelined for five months last season.
Arsenal kick off their Premier League season at home to West Ham United on Sunday.