The Welshman returned from his thigh injury against Everton but has not started a match since Boxing Day, while Kieran Gibbs, Tomas Rosicky and Alex Oxlade-Chamberlain are doubts
|7/1||Arsenal are 7/1 with Bet365 to beat Wigan 2-1 on Saturday|
The midfielder had been sidelined since Boxing Day with a thigh injury but returned as a second-half substitute during the club's 3-0 defeat to Everton last Sunday.
Meanwhile, Mesut Ozil and Laurent Koscielny have both been ruled out of the fixture at Wembley, while Kieran Gibbs, Tomas Rosicky and Alex Oxlade Chamberlain are all injury doubts.
“Ramsey is ready to start against Wigan. Ozil could be back next Saturday, Koscielny could be back for Tuesday," Wenger told reporters.
"We have a lot of uncertainties. Gibbs, Rosicky and Oxlade-Chamberlain are all doubts.
"[Lukasz] Fabianski will start in goal. It's a decision that has been made for a long time.
"We want to win the semi-final and it's important to focus on that. We respect Wigan highly.
"I'm expecting everyone to contribute because we have a lot of experience. We have played great games in the FA Cup."