First winger George North was carried off the pitch on a stretcher during the Pro12 clash between the Scarlets and Ulster.
His injury gives Wales a worry ahead of their Six Nations fixture against Ireland next month.
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A rather wet and windy evening, with rain in the north and showers elsewhere.
The 19-year-old's body was discovered in Builth Wells last month, just days after he was reported missing at the Royal Welsh Show.
The funeral has taken place of a one-year-old girl who died when a parked car rolled into a wall, which then collapsed on her.