Wolves striker Kevin Doyle has been forced to have a hernia operation after being troubled by the injury during pre-season.
However, boss Mick McCarthy hopes the summer signing from Reading will be able to return to full training in early August.
Doyle travelled to one of the world's top specialists in Munich to have the surgery, with McCarthy confirming to the club's official website: "Kevin's had a hernia operation but he'll be back for the start of the season.
"He came in and started to feel it in the first few days of training. I'm just glad it's a hernia and not a strained stomach muscle.
"We know what it is, he's been and had it done and will be out on the training ground in two weeks.
"He'll get his rehab and, while he'll be behind everyone else, he's a fit guy who puts a good shift in and he'd been doing alright.
"We just need to get him right which he will be in a couple of weeks."