The Dutchman took charge at Selhurst Park last summer but was given his marching orders after four Premier League games without a single goal or point.
“The Crystal Palace board panicked," he told Sport Express.
“We failed to make a good start for sure, I understand we needed to keep the club in the Premier League after they invested in the squad, but only after five games, I didn't think I deserved to get sacked.
“When the things were going bad, they just decided to change the manager which resulted in my sacking.
“I think we played better than the opponents most of the time."