Former Sunderland defender Darren Holloway says the club should do everything it can to hold on to Stephane Sessegnon.
Hollway was speaking after Sky Bet suspended betting on Sessegnon joining Tottenham Hotspur.
A statement on Twitter said the company cut their odds on the forward moving to London from 10/1 to 2/5, before suspending betting as money "piled in".
The 26-year-old was Sunderland's joint top scorer last season worth eight goals, and was named their player of the season.
Martin O'Neill has had to deal with persistent speculation regarding the Benin international's future since the season ended, but says he has no plans to cash in on a player seen as one of the club's top assets.
He told the Sunderland Echo: "You can never tell what's going to happen over the summer and I don't want to be saying anything categorically at the start of it which will make us look foolish at the end of it."
"I don't want to say something now which will be thrown back at me next season with people saying: 'Well you said this, or you said that'."
VIDEO: Michael Gray says Sunderland must keep Sessegnon
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