"We're waiting for the assistance of the fire service to get the water pumped away, then we can assess the damage to the playing surface and the undersoil heating," a club spokesman told PA Sport.
"We're maybe looking at the cancellation of the pre-season game against Birmingham on August 4, but we're still five weeks away from the first home game of the new season on August 11.
"There's a lot of residue left which now needs to be cleared up. A JCB has cleared the main car park but inside the building there's still a lot of work to be done."