Liverpool have reported Spartak Moscow to UEFA after teenage striker Rhian Brewster was allegedly subjected to racist abuse.
England's Under-19 World Cup winner was visibly angry at the end of the Reds' 2-0 UEFA Youth League win at Prenton Park and had to be restrained by team-mates and coaching staff at the final whistle.
Liverpool confirmed they have "followed the proper procedure by reporting the alleged incident to UEFA" and Press Association Sport understands the incident is believed to relate to alleged racist abuse.
It is the second time this season Liverpool have been forced to act against the Russian club after Brewster's team-mate Bobby Adekanye was racially abused by fans during the game in Moscow in September.
Spartak were found guilty on that occasion and ordered to partially close their academy ground for one match.
Liverpool Under-23s coach Neil Critchley insists they will not be "rolling out the red carpet" for England Under-17 World Cup-winner Rhian Brewster.
The teenager is set to make his return to domestic football in the Premier League International Cup match against Newcastle at Tranmere's Prenton Park on Friday.
Brewster was back at the club's Kirkby Academy on Tuesday for his first training session since finishing top scorer at the tournament in India and Critchley is keen to ensure it is business as usual for the 17-year-old.
"There's certainly no red carpet rolled out for him here," he told liverpoolfc.com.
"The experienced staff we've got here, good people with the right values, won't be getting carried away.
"There are a few people in the dressing room who will be keeping a lid on it so he won't be getting too big for his boots.
"He's not that type of boy anyway but, if he did, then we'd certainly nip that in the bud.
"There will be no issues with him, we'll have no problems.
"He'll come back in and he'll be the same happy, humble boy he was before he went away."