The Arsenal manager addressed reporters ahead of tomorrow evening's clash with Manchester United at the Emirates Stadium.
Giroud last appeared for Arsenal in the 2-2 draw against Everton in August where he sustained a broken leg. The Frenchman has been in training during the international break, and returns to the side a month ahead of schedule.
When asked about Giroud's fitness, Wenger said: "The surgery when well and there were no setbacks. He is very solid and has a positive mentality - that helps.
"Everyone has come back in decent shape. We have to check in with some players this morning, so we have lots to check today."
However, Wenger thinks that Theo Walcott will not be available for tomorrow evening's encounter with Louis van Gaal's side, after joining up with the international side for the first time since recovering from an ACL injury.
Tomorrow's game will see Danny Welbeck face up against his former club. The striker looked as if he could be a doubt for this weekend's clash when he appeared to have injured his hamstring in England's 3-1 win over Scotland on Tuesday, but it appears he will be ok for this weekend as the Arsenal boss say he will be assessed ahead of the clash.
Wenger said: "His fitness will depend on the medical assessment this morning.
"Welbeck is still a young player. I can understand Van Gaal completely. What's important is that he gets an opportunity.
"One reason we bought him was because he wanted to play. Playing centrally wasn't a condition."