The Arsenal boss has revealed that his France international striker was forced off against Swansea City after picking up a knock.
Olivier Giroud
Arsene Wenger says Olivier Giroud suffered an ankle injury in Arsenal's 4-0 victory away to Swansea City on Saturday.
The France international scored his fourth goal in as many Premier League games to break the deadlock in the first half but immediately signalled to the bench that he was in some discomfort.
Giroud lasted until the 60-minute mark, when he was replaced by Alex Oxlade-Chamberlain, while Arsenal fans were also given a slight scare when Alexis Sanchez was taken off for Danny Welbeck with 11 minutes left.
Wenger says Sanchez's withdrawal was simply a precaution but he confirmed that Giroud has taken a knock, though he would not speculate on the severity of the problem.
"Olivier Giroud did well again and he was important for us. He had an ankle injury after 30-35 minutes and got to 60 minutes," he said, as quoted by BBC Sport.
"I don't know how serious it is. We'll have to assess it. I don't know what the doctors have seen."
Swansea started positively but were undone by some slack defending for Giroud's opener, before two own goals from Jack Cork and Kyle Naughton - both of whom turned Alex Iwobi efforts into the net - ended their resistance and Sanchez added a late fourth.
"The first half was very intense physically, they gave a lot in the first half and then our pace took over," said Wenger. "They had problems to contain us.
"Swansea were very well organised and they closed down as a unit very well. We lost balls in the first 20-25 minutes which was down to them.
"In the second half, you could see we could create chances. Our transition and accuracy of passing was very good. We were fortunate with the goals, but the chances were there.