Crystal Palace’s board did not know Oliver Glasner was going to announce he was leaving the club ahead of Saturday’s loss to Sunderland, talkSPORT understands.The news caught senior figures at Palace by surprise, even though confirming Glasner’s end-of-season exit was officially billed as a joint-decision, and one made to coincide with the departure of Marc Guehi to Manchester City this winter.Glasner has endured a tumultuous few days as Crystal Palace bossAFPGlasner again referenced Guehi’s departure in the aftermath of the 2-1 loss to Sunderland saying he felt “abandoned” at the club, adding he “didn’t know” if he would be at Palace come the end of the season.talkSPORT understands Glasner and chairman Steve Parish are yet to formally speak about the latest explosive post-match comments.Sources close to Glasner insist the Palace boss does not want to quit, but those close to the Palace dressing room have told talkSPORT they believe the 51-year-old Austrian is trying to get fired.Parish will now be tasked with clearing the air in the coming days with tensions growing at Selhurst Park.No decision is expected on Saturday night on Glasner’s future, nor have Palace set a formal meeting to discuss it.Instead, Palace’s board are currently more concerned with how best to turn around a winless run of 10 games during a busy New Year period.The club have already broken their transfer record to sign Brennan Johnson for £35m from Spurs and are now expected to add another centre-back ahead of Guehi’s immiment move to Manchester City.The Palace captain will undergo a medical on Sunday.Those close to Glasner are not ruling out a mid-season exit, but Palace’s board are keen to avoid any knee-jerk reactions until time has been taken to assess both the current run of form and their manager’s level of commitment until the end of the season.Glasner announced on Friday he would walk away from Selhurst Park at the end of the season, citing his desire for ‘a new challenge.’The Austrian has not minced his words in the last 48 hoursGettyThe 51-year-old added it was a decision he had made ‘months ago’.” I had a meeting with Steve [Parish] in October, the international break,” Glasner said.“We had a very long talk, and I told him I will not sign a new contract.“We agreed at the time it was best to keep it between us. It’s the best that we could do that and keep it confidential for three months.“But now it’s important to have clarity, and we had a very busy schedule so that’s why we didn’t want to talk about it. Steve and I want the best for Crystal Palace.”Given Glasner’s future departure, which could be brought forward by Palace should they deem necessary, attention will soon shift towards who replaces the Austrian at Selhurst Park.Glasner led Crystal Palace to its most famous moment, as they upset Manchester City to win the FA CupGettytalkSPORT understands the Eagles have been exploring replacements for Glasner since last year.Rayo Vallecano’s Inigo Perez and Getafe’s Pepe Bordalas have both been approached, while Liam Rosenior was also on the list but has since joined Chelsea.