Ospreys wing Keelan Giles faces knee surgery after being hurt while in PRO14 action.
Giles, 19, was carried off during Ospreys' victory over the Dragons last Friday.
"Keelan has sustained a significant knee ligament injury and will require reconstructive surgery," Ospreys' medical performance manager Chris Towers said in a statement released by the Welsh region.
"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."
Although Giles is uncapped at senior Test level, he has been on the Wales coaching staff's radar for some time, and is viewed by many pundits as a challenger to make Wales' 2019 World Cup squad.