De Boer, now in charge of Atlanta United, lasted just months with the Nerazzurri.
Biabiany, now with Trapani, told ITA Sport Press: “For me, he was the worst coach in the history of Inter.
"He didn't get results in Milan and then he went to England to Crystal Palace and did even worse, but his style of football fails on all fronts.
"It hurt me a lot to hear from our coach that we were a rotten group, so much so that I answered back immediately.
“With him I didn't have a good relationship in every sense and not only from a technical point of view.
“In fact I never understood why he put me aside, but I wasn't the only one not to understand it because even those who always played in that Inter team said they did not understand De Boer's football and that he was always arrogant."