Lille chairman Michel Seydoux has slammed Moussa Sow's wage demands and admitted that new arrivals are needed.
The reigning Ligue 1 champions are currently locked in contract talks with their top scorer from last season.
Discussions with Sow have now dragged on for some time, though, with neither side willing to relax their stance.
Lille are in danger of being forced into a sale next summer, with Sow's current deal set to expire in 2013.
Seydoux hopes such a situation can be avoided, with further talks planned, but concedes that Lille have plenty of work to do if they are to keep their key men and bring in fresh faces.
He told La Voix du Nord: "You can get greedy when you already have a contract.
"There are, however, good times to talk about an extension and during the transfer window is not one of them. We will see what happens after 1st September."
He added: "I am aware that we need one or two reinforcements, but we can't stretch the club's finances any further.
"We will be on the lookout during the last week of the window. One player is essential, but we will try to get two if possible."