The 35-year-old, who has started all but two of City's npower League Two matches this season, is set to be sidelined for a month and manager Paul Tisdale knows what a loss the former Leicester man will be.
"He has been very energetic and mobile for a senior player and he has probably surprised himself with how fit he has been," he said. "It will be a loss for us but we have got some good players like Tommy Doherty and Arron Davies who can play in midfield, so it is just one of those things."
Tisdale will be without striker John O'Flynn (hamstring) for another couple of weeks while Liam Sercombe (broken ankle) is expected to miss the rest of the season.
Morecambe ran out 3-0 winners when the teams met at St James Park on the opening day of the season.