The Kenyan midfielder is the subject of a £12million bid from Southampton but he has been unable to agree personal terms with the Saints and does not want to join the Premier League club.
Wanyama's representative Ivan Modia suggests the Scottish champions are trying to offload the 22-year old in order to make a healthy profit.
"The player will not be forced into a corner to accept the Southampton deal, just because it is good for Celtic. There is no chance of him signing the deal on offer and both Celtic and Southampton were informed of this," Modia said.
"He has been with the club for two years - without a pay rise - and has given wonderful service.
"Added to this, by Celtic refusing him permission to join QPR last summer, Victor lost more than £1m in potential salary earnings."