There were fears that the 18-year-old midfielder, one of City's best performers in recent weeks, had suffered a serious leg injury following a challenge from AFC Wimbledon's Sammy Moore in Saturday's 2-1 loss.
City's fears were eased when X-rays on Sunday revealed Grimes had not suffered a break or fracture. But the soft tissue damage he sustained looks set to keep him out for the visit of the managerless U's.
Fellow homegrown midfielder Liam Sercombe picked up a slight injury in the build up to Saturday's trip and hopes to be fit as City look to end a run of six St James Park matches without a win.
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