Wesley Sneijder has assured fans he will overcome the anaemia and play the derby on Sunday, but urged support “for us and Rafa Benitez.”
The Inter midfielder fainted during the half-time break of last week's 1-1 draw with Brescia and has been diagnosed with anaemia.
He was rested against Lecce midweek, but told fans on his Twitter and Facebook pages that he will be ready to face Milan and revive Inter's flagging fortunes.
“When will overcome this moment of weakness I'll be at the best of my condition, the break of yesterday helped me to relax and reflect.
“We are in trouble, but there are alibis. We come from a fantastic season that no one fan will ever forget.
“True fans don't whistle their players even in times of difficulty. In the derby I won't miss because it will be like my debut, as it was last year. I'll never forget it.
“I'm recovering, we need your support, both us and Mr. Benitez. He's a great coach, just as it was Mourinho.
“Jose Mourinho is the past, the derby is the top of the season. We must think about present not past. So let's play!”