Brewster, an England Under 17 worldwide, was visibly angry and had to be restrained by teammates and coaching staff towards the end of Liverpool's 2-0 victory over the Russian team at Prenton Park.
Brewster told referee Mohammed Al-Hakim of the alleged abuse - which happened towards the end of the game - and also informed the fourth official.
Brewster was still angry at full-time and looked to confront one of his opponents, while Gerrard and Liverpool's academy director, Alex Inglethorpe, both spoke...
Asked about the incident, Liverpool under-19s coach Steven Gerrard said: "It's hard for me to comment on it right now".
"But you've got Rhian (Brewster) returning, who's just won a World Cup, who played well before he left, and they're the decisions you've got to make".
'The only thing missing from his performance was a goal.
It is the second time during Liverpool's UEFA Youth League campaign that a player has suffered racist abuse during a match with Spartak.
The Reds managed just a 1-1 draw in the reverse fixture in Russian Federation back in September.
Jurgen Klopp's side have made tough work of their Champions League campaign, but can book a last 16 spot as long as they do not lose against Spartak Moscow this evening.
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