Roberto Martinez believes Maynor Figueroa is worth far more to Wigan than current estimates.
The likes of Tottenham and Sunderland are both believed to be interested in the Honduran full-back, who grabbed the headlines with a stunning goal against Stoke last weekend.
Reports have suggested that a deal could be agreed in the region of £6million but Martinez insists that value is 'out of proportion'.
The Latics manager is under no pressure to sell and has warned Figueroa's suitors that no amount of cash can compare to his priceless role in the club's future.
"Staying in the Premier League and achieving what we want to achieve has no price," said Martinez.
"If you are going to put a price on achieving that then it (the £6million price tag) would be out of proportion.
"As I've said before, we're not in a situation where we have to sell players, and that's our biggest strength in this window."
Martinez is confident he will keep Figueroa and all his key players in the January transfer window as he looks to build the foundations for long-term success.
"I'm not fearful of losing Maynor, not at all," he stressed.
"There have been a few mentions of three or four players who have been performing really well recently, but I have no fear of losing any of them because we want to achieve our aim.
"That is to get into Europe in three years' time, and to do that we have to stay in the Premier League.
"It means the next three months are going to be vital for us for that, and we need every single player."