Man City fear Richards knee injury setback
Richards, who only played his first game of the season at the beginning of October after an injury, pulled up and clutched his knee in the 75th minute without any other player close to him.
"I'm not sure what Micah has done yet," said manager Roberto Mancini.
"We think he has a problem with his knee but we won't know until next week. But I obviously hope he will be okay."