The Dutch manager has experienced a very hard start to his time with the London club.
"But for me it's simple in that they are where they are because of the defensive record again - they haven't been good enough individually and collectively to stop silly goals going in by making mistakes rather than great goals going in against them". The club are said to have contemplated sacking De Boer during the worldwide break, as the relationship between the manager and Palace chairman Steve Parish is reportedly "at breaking point".More news: Putin rues awarding USA top diplomat Tillerson Russian state honour
Palace have yet to score in the Premier League this term and face Burnley, live on Sky Sports Premier League on Sunday, as one of three sides - alongside Bournemouth and West Ham - who have failed to register a point this season.
The former Barcelona defender won four league titles with Ajax between 2010 and 2014, but his managerial career hasn't gone to plan since leaving the Netherlands.
After a month of umming and ahhing Palace opted for De Boer as Big Sam's successor in the Eagles dugout in June - just under eight months after his embarrassing 85 day spell at Inter Milan came to an end.More news: Chinese Military Practices 'Surprise Attack' Near North Korea
"I think it's been something that certainly Steve [Parish] and the American owners wouldn't have wanted to happen after what happened last season", he told talkSPORT.
"The long-term development of a football club by a manager can not be more than what is going to happen this year and by the end of next year I have got to try to keep my job by getting enough results". Even if they beat Burnley, Palace will most likely sack De Boer sooner rather than later if they're having doubts about him already.More news: Merkel, Abe agree sanctions against North Korea should be stepped up
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