Zamora suffered an injury-plagued spell last term.
Sidwell told FulTime: "The leg break last season came as a massive disappointment and I for one was gutted for him. Up until that point things had been going very well for him - he had just won a deserved England call-up, he had signed a new contract with Fulham and he was on a real high.
"But that's football I suppose, you never know what is around the corner. But he's back now and I know he'll be looking forward to getting the new season started and doing what he does best."