Cardiff Blues say prop Brad Thyer was hospitalised for four nights with concussion, but has since been discharged.
Cardiff Blues Rugby Union
Wales head coach Rob Howley says the introduction of bonus points will play a part in his team's approach during the Six Nations.
Lock Alun Wyn Jones takes over from Sam Warburton as Wales captain for the 2017 Six Nations.
Cardiff Blues boss Danny Wilson hopes Gareth Anscombe and Nick Williams return from injury as they host Bristol on Saturday in the European Challenge Cup.
Audio & Video
Watch Clwb Rygbi's Welsh-language highlights as Glasgow Warriors regain fourth place in the Pro12 with a 29-15 win over Cardiff Blues.
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