Guehi, who is out of contract in June, saw a last-gasp move to Liverpool blocked at the end of the previous window, before rejecting a new deal at Palace in October.

Manchester City has emerged as a contender to land the defender's signature, after injuries to Ruben Dias and Josko Gvardiol during Monday's (AEDT) draw with Chelsea.

Real Madrid, Barcelona, Bayern Munich, Inter Milan and Atletico Madrid are also reportedly interested in the England international, who can sign a pre-contract agreement with an overseas club this month.

Guehi captained Palace to its first major honours in 2025, as it beat City to win the FA Cup, before edging out Liverpool in the Community Shield on penalties before the start of the Premier League season.

"I'm not naive," Glasner said. "If a massive offer comes from City and Marc wants to do it, it will happen.

"If you're just valuing sports, everyone in the club will say Marc has to stay. The chairman will tell you the same. But it's not one-dimensional. If you see the financial situation, it's very important.

"If somebody comes, there will be a moment when the club says 'now the financial issue is more important than the sports issue'.

"There will be a threshold where the club has to say it will happen – as long as Marc says 'I want to leave', because the final decision is always with the player."

Palace held title-chasing Aston Villa to a 0-0 draw at Selhurst Park on Thursday (AEDT), another feather in Guehi's cap, but the Eagles have now failed to win in their past eight matches as their mid-season slump continues.

But Glasner said after the match he was optimistic Guehi would stay.

"[I'm] no more worried than in the summer, because the summer would've been the same," the Eagles boss said.

"If the offer had been high enough that the club was fine with it, and if Marc wanted to go, he wouldn't be a Crystal Palace player anymore.

"I think Marc will stay, but if Marc says: 'I want to leave', and a club pays massive money – with five months left of a contract – every player will leave if you're playing for a club like Crystal Palace.

“I think last January would've been the same, and the year before would be the same. Every single player has a price where the club will sell him when you're Crystal Palace, and maybe because we're not the end of the food chain in football.

"For me, it was a little bit surprising what was made out of it, because it's exactly the same situation as it was in the summer.

"Right now, when I see him playing, when I see him training, when I see his commitment and when we are talking quite often together, then I think the fans can be really be calm, but you never know what will happen in football."