The 28-year-old is continuing his rehabilitation from the ruptured patella he suffered in November and recently underwent a clean-up operation.
"I come out of the brace next Wednesday and go back to see the surgeon at the end of July," he told Wolves' official website.
"I'm back in doing a bit of work at the moment but hopefully after that I can really start stepping things up again.
"I'm gutted not to be ready for pre-season. But I'm not putting any pressure on myself now in terms of setting a date.
"I can't afford to push myself too much - making sure it's all done properly is the main thing and when I'm ready, I'm ready. It's certainly going to be an exciting season and one I'd love to be involved in at some stage."