Speaking in this weekends Nottingham Evening Post, Shirtliff said "An extension to Richie Barker's contract has been spoken about,"
"He is happy, but he has intimated to me and the chairman he wants a new deal and it is something we are looking at.
"We've had a number of positives to come out of this season and Barker's goals and performances have been two of them."
Baker was a shining light in a difficult season for the Stags, and rumours during the season linked Grimsby and Swansea with bids for the frontman.
He also has one year left on his current deal.