McGeady arrived at Wednesday on loan from Everton in the January transfer window, and he was expected to make a huge impact at Hillsborough.
However, the skilful winger has made a rather slow start at the Yorkshire club.
McGeady’s impact in his first few matches was minimal, but he showed his class in Wednesday’s penultimate match before the international break.
The Republic of Ireland international managed to score during a 3-0 win over Nottingham Forest, and Wallace is expecting the wide man to kick on now.
“Aiden came to us with not a lot of games under his belt,” he said. “It was the same when Gary Hooper and Fernando Forestieri joined us. They took some games to get going.
“Aiden played really well at Forest and got his goal. He would have been disappointed to be taken off against Charlton. But, if I know Aiden, he will comeback stronger and be fighting to get in the team on Saturday.
“Everyone knows Aiden has got quality and will come good. There will be times in the last eight matches when he will win us a match just with a bit of magic.”
McGeady joined Wednesday short of match fitness, as he found appearances at Everton hard to come by this term.
The 29-year-old played just once for the Toffees over the early part of the campaign, but he has featured far more prominently for Carlos Carvalhal’s side.
McGeady has already made eight appearances for the Owls, and he will be hoping to help the side secure their place in the play offs.