The former Arsenal midfielder struggled for minutes at OL before Grosso was sacked.
He told L'Equipe: "It wasn't new to me.
Advertisement
Advertisement
"He didn't know me as a person. He never asked me how I felt or what I wanted. I stayed quiet, I worked. He left before we had a conversation."
Maitland-Niles is now impressing under Grosso's replacement, Pierre Sage.