Bury boss Alan Knill has revealed Grimsby have made a surprise enquiry for striker Andy Bishop.
The 27-year-old signed a bumper new deal in January 2009 to boost Bury's League Two promotion bid rather than move to a higher division.
That contract runs to the summer of 2012 while Grimsby are gearing up for life in non-league after being relegated from League Two last season.
Yet the Mariners have targeted Bishop as the man to lead their bid for an immediate return to the Football League.
But Knill is keen to keep hold of Bishop, Bury's leading scorer for three of the last four seasons, and he doubts whether Grimsby would be able to afford a fee for the former York striker.
"At the end of the day it's Andy's decision, but Grimsby was just an enquiry - they were not coming in to buy him," he said.
"I want him to stay, and the good thing is that he wants to stay, so as of now he has two years left on his contract.
"If somebody makes a bid for him, then we have to seriously consider it, but I don't think we are in the business of letting anybody go for absolutely nothing."
Grimsby's assistant manager is former Bury boss Chris Casper, who signed Bishop from non-league York on a free transfer in May 2006.