Goal-kicking fullback James Hook could miss Wales' remaining World Cup pool games after injuring his shoulder in the tense win over Samoa, team officials said on Monday.
Hook, 26, was withdrawn at halftime as Wales trailed 6-10 before they came storming back to win 17-10. Backrow forward Dan Lydiate also limped off early in the game and was to undergo a scan on a rolled ankle.
"They're going for scans. It's a little bit clearer what James has - he's done his AC joint, whereas Dan has to go for a scan today and we'll know more after that," said assistant coach Shaun Edwards.
"We're still in the dark about Dan whereas with James it's a little bit easier to detect what it is."
Edwards said Hook, who underwent shoulder surgery last year, had suffered grade one or two damage to the joint, which "usually means two or three weeks" on the sidelines.
The projection means Hook will miss next week's game against Namibia and could also be out for their final Pool D clash against Fiji - as well as a possible quarter-final expected on October 8.