The 29-year-old will be fit to face Sunderland on Saturday.
“Chris is 100%, he has trained really well and he is going to come straight into the squad,” Martinez said.
“I am probably now in the best position since I arrived here in terms of goalkeeping options, and to have Ali performing in the manner he has and then having Chris fit, that is a very strong position to be in.
“Sometimes Chris has played through the pain barrier and he has done it for the football club.
“That will always be in my mind, so whether Chris is in a good or bad moment of form, he will always be an important player for Wigan Athletic.”