Scotland star Max Evans is likely to miss the start of next season after tests revealed he suffered a serious knee injury against the Ospreys last weekend.
Evans will be out for between four and six months after a scan confirmed the Scotland centre damaged his medial ligament in Glasgow's defeat in Wales.
The utility back, who made his Scotland debut in the November Test against Canada last year, impressed in his first experience of the RBS 6 Nations in 2009.
He was left out of the team for the championship opener against Wales at Murrayfield but started every game thereafter and formed a fine partnership in midfield with fellow Warriors star Graeme Morrison.
Glasgow team doctor Gerry Haggerty said: “The outcome of the scan shows that Max’s anterior cruciate ligament is intact which is positive news.
“He has a medial ligament injury and some cartilage damage. He will undergo an operation to repair the cartilage and this procedure will also uncover any injury to the ACL that the scan may not have revealed.
“At this stage, we can estimate that Max could be out for approximately four to six months.”