"It looks like it could be longer than the normal six-week metatarsal injury which is a shame," he said.
"You always know when Robbo is out there he is a leader on the pitch. But we have to get on with it, we have players here who can step in and do a job. It's unfortunate but we can't let it affect our season too much.
"The last thing I wanted was to be back in the team through the skipper's injury but now I've got to step up my game - we've got some big games coming up."