Robinho was playing for the first time since a long injury lay-off and earned an ovation when he was substituted on 75 minutes.
Hughes said: "I thought we'd be delighted to get 60 minutes out of him, we got 75. He looked really sharp until he faded towards the end. He needs game time, but we're pleased he's back."
Hughes explained to City's website: "We're trying to protect Gareth. He's carrying a bit of discomfort in the groin area and we want him available for the rest of the season.
"We don't want him compromised so that he can only play at 60 or 70 per cent, and we don't want his injury to become chronic. He'll be available for the Carling Cup against Arsenal."