Jon was one of the established players missing from the Scotland squad for the opening Six Nations match with Wales in Cardiff. He captains Glasgow against Neath/Swansea Ospreys at The Gnoll tonight (7.15pm).
"It is unfortunate for Jon," said Campbell. "His display in last month's Parker Pen Cup victory over Saracens was one of the best performances I have seen from him. I expect he will want to get a message across to the Scotland's national selectors."