The midfielder will therefore be out of contention for the games with Charlton and Birmingham.
Kevin Keegan has been hoping that Wanchope would be available after international duty, but the Costa Rica striker is yet to return.
Robbie Fowler will continue in attack against his former club after scoring City's goal last week, and is two strikes from scoring 200 career goals.
City (from): James, Thatcher, Distin, Reyna, Fowler, Sibierski, Macken, Jihai, Mills, Dunne, Barton, Bosvelt, Sinclair, Wright-Phillips, Anelka, Jordan, Flood, Ellegaard.