The brother of Liverpool star Luis Diaz kicked off the youth team brawl between the Reds and Porto.
Liverpool's U19s saw off Porto in the UEFA Youth League at Kirby before tempers flared on Merseyside.
The Reds came from behind to secure a 1-1 draw on the night before enjoying a 6-5 victory on penalties. Jesus Diaz - the brother of current Liverpool star Luis Diaz - was among those to miss for the Portuguese side, who would seemingly take exception to the celebrations, reports the Mirror.
A mass brawl ensued on the pitch with three men eventually being sent-off, which included Liverpool's Lewis Koumas. Subs from both sides ran on as the players began shoving each other with the linesman having to duck for cover as punches were thrown.
Liverpool's youngsters have already been involved in unsavoury scenes this season. They clashed with Ajax's players during a 3-1 defeat earlier this season.