Heckingbottom has confirmed he intends to hold talks with a number of players in the coming weeks who are due to fall out of contract next summer.
The Tykes boss is hopeful he can tie his key men down to new deals, but says if any player decides not to put pen to paper the club will not be forced to sell in the January window if a suitable replacement cannot be found.
“There have been initial talks with the club telling the players we’re going to offer them new deals,” he told the Sheffield Star. “That will be ongoing. It’s more a case of saying we appreciate what they’ve done and giving them that security if you like.
“That way they know there’s something here for them. Whether they sign it or not will be a different matter and that’s the bit where it could run on and on. They’ve played themselves into a position where they may want to sit their contracts out.
“We knew that as a club and we had to expect that because we’ve succeeded off the back of the players performing really really well.”
He added: “If the club can’t tie them down then we need to accept that. We don’t need to do that [sell them in January].
“We wouldn’t sell anybody if there wasn’t a suitable replacement to come straight in. We’ve made it clear as a club that keeping Championship status is our priority.”
Striker Sam Winnall and skipper Conor Hourihane are among the players who are out of contract at the end of the season.