Wales have suffered an injury scare only weeks following Rhys Patchell was driven off against Ireland through their Test match.
The left the pitch throughout the first half in the Aviva Stadium to get a head-injury evaluation.
Dan Biggar replaced him and did not go back to the game.
Patchell has suffered an injury-hit campaign, suffering hamstring and concussion problems, and made his first Test start in.
The Scarlets player secured his position at Wales’ 31-man World Cup squad following an impressive try-scoring functionality in a week’s defeat .
Warren Gatland is without first-choice fly-half Gareth Anscombe, who sustained a serious knee injury during Wales’ very first World Cup warm-up match against England last month and will miss the championship in Japan.
Wales start their World Cup campaign against Georgia.
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