But sources say it is unlikely the Portugal star will be hit with a two or three-game suspension, meaning he will be available to play at Old Trafford on October 23 and in the return match in Turin on November 7.
Extended bans are usually handed out for more serious offences.
"The contact looked very slight and I cannot see how the additional assistant, standing some 20 yards away, could deem it violent conduct", Clattenburg said.
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After being sent on loan to West Bromwich Albion last season, the injury-prone England forward's Liverpool career looked over. "Right at the end, we had the chance with Julian Draxler that could have won it before Liverpool scored".
Under the body's no player has the right of appeal a one-game ban but sources claim that disciplinary officials, having viewed television clips of the incident, may not add additional ban, even though he left the pitch amid arguments.
In the meantime, Ronaldo will miss out of Juve's next group game against Swiss side Young Boys in Turin no thanks to the 11th red card of his career, but first in the Champions League.
Juventus' Portuguese forward Cristiano Ronaldo (L) cries next to Juventus' Italian midfielder Federico Bernardeschi after receiving a red card during the UEFA Champions League group H football match between Valencia CF and Juventus FC at the Mestalla stadium in Valencia on September 19, 2018.
Ronaldo was sent off for seemingly tugging Jeison Murillo's hair before the half hour.
"Going down to 10 men in the Champions League for an incident like that is disappointing".