Sam Winnall's Owls comeback has been hit by another injury setback.
The talented centre-forward sustained a hamstring problem while on Wednesday Under-23s duty last weekend.
Winnall played 70 minutes of Saturday’s development match against Hull City as the Owls claimed a 1-0 win at the KCOM Stadium.
But his fresh injury blow is likely to keep him out of action until November.
It was Winnall's second U23s outing since shrugging off a calf issue.
"Sam played 70 minutes but he had a problem with his hamstring," said Wednesday chief Jos Luhukay. "He will not be available for a couple of weeks.
"It's very disappointing for Sam. He came close to getting back in the first-team but he has another injury now. We must have a lot of patience and try to help him come back to the team in a few weeks time."
The 27-year-old, who suffered a seious knee injury on loan at Derby County last season, has not played at senior level since February.
Luhukay, who expects midfielder Kieran Lee (knee) and centre-forward Gary Hooper (groin) to not be fit to play until the New Year, said: "Sam is working to come back. He had a calf problem on his leg. Now he has a hamstring problem.
"When you have been out a long time, you try to create a good basis in the training sessions to then play games.
"Sam played only one half last week for Under-23s and 70 minutes on Saturday.
"He was out of football a long time. It is hard for the player himself but he must handle that and try to come back again."