The Belgian is unhappy with his situation at the club and has a poor relationship with club owner Robert Louis-Dreyfus.
“Despite my work, there was a lack of gratitude and most of all a lack of trust,” said Gerets.
“If I had been offered a new two-year contract with the same wage or a little bit more before the end of March, I would have signed immediately.
“He (Louis-Dreyfus) would have sent a strong message if he had told me as soon as January he wanted me to stay, while we were fourth in the league.”
