Gloucester flyhalf Owen Williams could be in hot water after Newcastle Falcons posted a image which appears to show the Welshman with his fingers in the eye area of a Falcons player.
Liam Williams was sent off in the 37th minute to ruin Scarlets’ chances of a hat-trick of Welsh derby wins, as Cardiff Blues ran out 29-20 winners.
The four Welsh regions will all play each other over the next three weeks as part of the Pro14's traditional Christmas derby window.
Johnny Williams scored a try for England at Twickenham last year – but he only has their downfall in his sights on Saturday.
Social media has been busy with rugby luminaries praising this Saturday's 100th Test milestone in the stellar career of referee Nigel Owens.
With Wales stepping up preparations for Saturday's trip to Paris, Liam Williams and Jonah Holmes have been released for PRO14 action.
Ken Owens is one of two injured players who have been excluded from the Wales squad after being unable to sufficiently train this week.
Wales centre helped Ospreys kick-start their season with a 25-10 win over Edinburgh, but has his sights set on bigger and better things in the not-too-distant future.