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Scotland lock Grant Gilchrist is likely to miss the remainder of the season after suffering yet another injury blow.
The Edinburgh second-rower suffered a fractured forearm after making a second-half substitute appearance away to Ospreys on Friday night.
It is a cruel blow for the 25-year-old, who was making his comeback in Swansea four months after suffering a groin injury during last year's World Cup.
Gilchrist, who was tipped for a recall to Vern Cotter's squad for the final stages of the RBS 6 Nations, also spent eight months out of action before the World Cup after suffering complications to a broken arm.
A spokesman for Edinburgh said: "Edinburgh Rugby is disappointed to report that lock Grant Glichrist sustained a fracture to a long bone in his forearm during a collision in Friday night's Guinness PRO12 match against Ospreys at the Liberty Stadium.
"Gilchrist has seen a specialist and will undergo surgery today.
"The injury sustained is not to the same bone that required medical attention prior to Rugby World Cup 2015."
The 6ft 7ins forward had been tipped for a move to French giants Toulon this summer.
The lock was also due to skipper Scotland during the 2014 autumn Tests before being ruled out when he suffered his first broken arm in a European Challenge Cup tie with Lyon.