Josh Navidi picked up a hamstring problem in the win over France.
Wales have suffered an injury blow ahead of Sunday's World Cup semi-final with South Africa.
Back-row forward Josh Navidi has been ruled out of the rest of the tournament in Japan with a hamstring problem.
He picked it up in yesterday's dramatic victory over France in the last-eight.
Head coach Warren Gatland is yet to decide who he'll call-up as a replacement.