Kenya midfielder Victor Wanyama has snubbed Celtic's offer of an improved contract, according to his agent on Thursday.
Wanyama's current deal with the Scottish champions lasts until 2015, but Celtic were keen to tie him to a new contract to fend off interest from several English Premier League clubs including Manchester United.
However, the 21-year-old, who joined Celtic from Belgian side Beerschot in 2011, doesn't believe the Hoops' offer reflects his value and he has rejected the deal.
Wanyama's agent Rob Moore told STV: "Victor has informed Celtic the contract offer fell short of his expectations.
"There were a number of aspects that fell short - he turned it down."
Celtic reportedly turned down an offer for Wanyama from an unnamed club in the close-season and, while Moore insists his client remains happy at Parkhead, he believes the Nairobi-born star deserved to be rewarded with a significantly improved contract for staying committed to Neil Lennon's team.
"He is very happy with the job he is doing at the moment. He is a great professional and his commitment cannot be questioned," Moore added.
"But it doesn't take a rocket scientist to work out that he lost great earning potential in the summer (by not moving to England)."