The goalkeeper collected a knock in victory over Everton last week.
Wenger said this morning: "We should have a similar squad to Everton. Maybe Welbeck will be back.
“We are not sure with Cech, he has not practised. I don't know if he should be available.
“Nacho Monreal should be alright."
He added: "“I have no problem.
“Ospina or Cech, I will make that decision tomorrow.
“I will not take any risk if he is not 100 per cent for because I have full confidence in David Ospina."