Celtic are angry over claims from Victor Wanyama's camp that he's being forced into a move to Southampton.
The Daily Mail says agents Rob Moore and Ivan Modia believe the Parkhead club are trying to push the 22-year-old towards Saints.
But a Celtic spokesman said: "These negotiations, like any others, are carried out by Celtic in a proper, private and professional manner.
"Celtic carries out its business with integrity, we work to the highest standards and in the interests of the club, our supporters and indeed our players.
"We do not need to comment any further on this matter."