He was subbed against Preston in midweek and is expected to be out until the new year.
Robinson was replaced by Gareth Whalley.
With Graham Kavanagh still not quite ready to return, Jason Bowen out until the new year and the departure of Julian Gray and Layton Maxwell this week City are stretched in the midfield department.
The only 4 fit midfielders we have will start against Norwuch tomorrow. Langley, Bonner, Boland and Whalley.