The Nigeria international, 32, was targeted on social media after a 2-1 victory that moved Trabzonspor above their opponents into third place.

The club say they have filed "criminal complaints" against those responsible.

"Racism is a shelter for [the] helpless and ignorant," Trabzonspor said in a statement on Twitter.

Mikel's Trabzonspor team-mate Joao Pereira said it was "sad and unacceptable".

"Football is much bigger than the little people behind these unfortunate acts," he wrote on Twitter.