West Brom defender Jonny Evans could be out of Northern Ireland's crucial Euro qualifiers.
The 27-year-old centre-back will have a scan on Sunday after hobbling off 24 minutes into West Brom's Premier League defeat by Crystal Palace.
Northern Ireland face Greece at Windsor Park on Thursday, then play Finland in Helsinki three days later.
"Fingers crossed he will be OK. If he is anywhere near fit we will give him a chance to play," said manager Tony Pulis.