AC Milan striker Alexandre Pato is set for at least three weeks out after suffering an adductor muscle tear, the club says.
"In the coming days new medical tests will be carried out to determine more precisely the nature of the tear to the right adductor muscle," a club statement read, adding that the 22-year-old suffered the injury in training on Wednesday - just four days before the new season starts.
Having just suffered an Olympic Games final loss to Mexico with Brazil, Pato now has to digest more frustration - he missed 30 games last season in a campaign that was brought to a premature end when he tore a muscle in a UEFA Champions League match against Barcelona.
Going back to 2010 an assortment of injuries have kept Pato out of action for a total of 405 days.
Inter Milan president Massimo Moratti admits he has a difficult decision to reach as he considers whether Andrea Stramaccioni should remain as the club's head coach.