Wigan manager Roberto Martinez does not have any problem fielding Charles N'Zogbia at Birmingham.
N'Zogbia is expected to receive a rough ride at St Andrews after Wigan accepted Blues' bid for the winger last month, but the club could not agree with the 24-year-old's wage demands.
The France international was the matchwinner in Wigan's 2-1 victory against Championship side Preston in the Carling Cup on Wednesday night.
And Martinez admits to being delighted with his contribution since the deal fell through.
He said: "I think that's well in the past. The transfer window brings you that sort of speculation but once the window closed I've been very happy with the focus and concentration of the players, especially Charles.
"We forget the players are human beings and the transfer window being open while the competition is going on is really wrong.
"But I've been really pleased with his reaction, the players have been really happy with his attitude and his behaviour and the way he performed on Wednesday showed the talent that he's got.
"I don't think it's going to affect anyone. It doesn't concern me at all. What is important is the way we're starting to gel as a team."
The Latics boss believes Wednesday's league cup third round triumph at the DW stadium could prove a very important victory as the club aim to end Birmingham's unbeaten home record, which stretches back almost a year.
"It's a great positive in the way we got through," he said.
"It was very difficult for us and the way we reacted was really positive and the way we finished the game gave us a great feeling.
"You could see the dressing room feeling really good and you need experiences like that to develop as a team.
"I feel now we can take that into the league."