Wigan manager Roberto Martinez has criticised Alex McLeish for going public over Birmingham's interest in Charles N'Zogbia and claims their offer is less than one they rejected earlier in the summer.
The French winger has been linked with a move away from the DW Stadium all summer and Birmingham boss McLeish heightened the speculation by revealing his club had put in a new bid.
The news has angered Martinez, particularly as he claims they have actually reduced the bid.
The Spaniard said: 'The offer is less than the one we had in May and then they come out publicly in the press about it. It doesn't look serious to me.
'The valuation is very clear. If the team matches it he can speak with them. Until that happens he is a Wigan player.
'The transfer window brings you that distraction but when you get other managers talking about your players, that is really disappointing - to unsettle players and the press with no substance behind it.
'I don't know the reason behind it, whether it is to get the fans' hopes high in your football club, I don't know.
'Charles has had a difficult few days and it is our fault. We should not allow the transfer window to be open when the competition is ongoing.
'I don't think it is respectful to the league or the fans and it needs to be considered by the authorities.'
Alex McLeish raises stakes in Charles N'Zogbia chase with improved bid for Wigan winger Hartlepool 0 Wigan 3: Jordi Gomez and Victor Moses on target as Carling Cup win eases pressure on Roberto Martinez WIGAN FC