Birmingham have made an increased offer to land Charles N'Zogbia from Wigan.
The Blues have been chasing the French winger's signature all summer, and had an offer turned down at the end of last season.
However manager Alex McLeish is keen on bringing the former Newcastle wideman in at St Andrews, and is looking favourite to win the race for his signature.
The 24-year-old has become one of the most important components of the Latics team, but it is thought that he is keen to move elsewhere.
Sunderland boss Steve Bruce, who signed N'Zogbia when he was at the DW Stadium is also interested in the player, but Wigan are thought to be holding out for a figure of around £10million.
McLeish admitted in a press conference that they had not heard back from the Latics as of yet, but appeared confident of landing his man.
"We've made another bid for Charles and we wait to see if it's successful or not," McLeish said.
"We've had no response but we're hopeful that the player will come. If there's other clubs in for him then we'll have to wait and see.
"But we've tried and we've tried our best. The directors and the board have worked hard to make these kind of things happen."
The Scot added that he was interested in bringing further players into his squad, but admitted it would be hard to get the deals fully completed by the time the transfer window closes on Tuesday evening.
"There's a few others, but it's difficult getting them over the line," he added.
"That's going to be the hardest part, the deadline's coming, Tuesday's the deadline day so it'll be a mad scramble.
"Getting medicals in place is going to be the most difficult thing.
"We don't have to name our squad til after the window closes so it will be dictated by the players who arrive or don't arrive."