Ospreys wing Keelan Giles is likely to be sidelined for a lengthy period with a serious knee injury.
The 19-year-old was carried off on a stretcher during last Friday's 28-14 Pro14 win over the Dragons.
"Keelan has sustained a significant knee ligament injury and will require reconstructive surgery," Ospreys medical performance manager Chris Towers confirmed.
Giles has long been tipped for a Wales cap but has suffered with injuries.
The Wales Under-20 wing missed out on senior Six Nations selection through injury for the 2017 tournament.
"We are currently in the process of seeking expert opinion to formulate the best course of management going forward and will provide appropriate updates when necessary," Towers added.