West Brom goalkeeper Ben Foster has been sent to a specialist in Germany to determine the extent of his recurring groin injury.
The former England international struggled during Monday night's home win over Southampton, unable to kick with his preferred left foot.
Foster was ruled out of the final game of last season against Arsenal with a similar problem and also missed part of pre-season.
Albion are awaiting the diagnosis but manager Steve Clarke remains hopeful Foster will yet feature in Saturday's match at Wigan.
"Ben is in Germany," Clarke said. "Most of you noticed on Monday night that he was kicking with his right foot and not his left foot.
"He has gone out to see a specialist. We are waiting on the diagnosis. Fingers crossed, it is positive and I'm hopeful he is available to play again at the weekend, kicking with his right foot.
"It is a problem with the groin and hopefully it is something we can manage in the same way as with Shane Long and his hamstring over the last few weeks.
"If we can manage him, then we can get a few more games out of him. What are his chances for Saturday? Probably 60-40 in his favour."
Boaz Myhill is on standby should Foster be ruled out.