Alex McLeish: "We've put in another bid for Charles (more than £8m), we can only wait and see if it's successful.
"We're awaiting Wigan's response. At the same time we're in the hands of the gods in terms of the other offers. If there are other clubs in for him, then we have to wait and see.
"But we've tried - and we've tried our best. The board have worked hard to make these kind of things happen."
Sunderland, managed by former Birmingham boss Steve Bruce, Juventus and Fiorentina have also been linked with a move for the former Newcastle player.
He was a constant problem at St James' Park and Scott Parker is famouse for pinning him up against the dressing wall and threatened to push his mobile phone up N'Zogbia's arse.
N'Zogbia was left out of Wigan's opening day 4-0 defeat against Blackpool after Martinez criticised his attitude.