Wales centre Jamie Roberts faces six weeks on the sidelines after injuring his elbow, his club, Cardiff Blues, revealed on Friday.
Roberts hyper-extended the joint during Wales' 14-12 loss to Australia last weekend and is scheduled to see a specialist.
He is expected to miss the Blues' remaining Heineken Cup pool fixtures against Montpellier (home and away), Toulon and Sale Sharks.
The injury will also hinder Roberts' preparations for the Six Nations, with Wales due to begin their title defence against Ireland at the Millennium Stadium in Cardiff on February 2.
Roberts only recently returned to international duty after a long period out of action following surgery on his knee.