Jack Wilshere will miss key games for Arsenal and England after being ruled out for "a few weeks" with an ankle injury, Gunners boss Arsene Wenger has said.
The 23-year-old England midfielder's career has been punctuated by injury and now he has suffered another - a hairline crack of his left fibula.
Wilshere will miss Sunday's Premier League season opener with West Ham and is also likely out of England's Euro 2016 qualifying Group E fixtures with San Marino and Switzerland next month.
Wenger said: "I had a bad surprise because it is a hairline crack in his fibula which makes it a few weeks out."
Reports suggested Wilshere could be sidelined for around two months, but Arsenal have not put an exact timescale on the injury yet.
Wenger added: "There is minimal damage apart from the bone damage.
"It was a collision in training and it was all completely accidental."
Forward Danny Welbeck (knee) will also miss the opening game of the season, along with midfielder Tomas Rosicky (knee).
Alexis Sanchez is also unlikely to be included after winning the Copa America with Chile in early July.