Guehi, 25, came close to joining Liverpool on transfer deadline day, but Palace pulled out of the deal as they were unable to sign an adequate replacement.
The England international’s current deal at Selhurst Park is set to expire at the end of the season, with clubs both domestic and abroad interested.
Glasner has now confirmed that Guehi has informed the club that he will see out his contract in South London and move on next summer.
"I think Marc has already told us that he doesn't sign a new contract, so he will leave next year," said Glasner on Friday.
"The club wanted (him to stay). They offered Marc a new contract. But he said, 'no, I want to make something different'. And that's normal.
"And for us, it's how we can deal with this situation? (What) is the best way to get this next step done? And that's all about how we are talking together."