Watch FA Cup highlights - Liverpool youngsters beat Southampton to set up Manchester United clash

Jurgen Klopp's kids did him proud again as Lewis Koumas scored on debut and fellow 18-year-old Jayden Danns registered his first two goals as a depleted Liverpool side beat Southampton 3-0 at Anfield.

Victory, just three days after an exhausting 120-minute Carabao Cup final win over Chelsea, set up an FA Cup quarterfinal at arch rivals Manchester United.

Koumas, son of former Tranmere and West Brom midfielder Jason, was one of six players 21 or under in the team.

And it was one of his fellow academy colleagues Bobby Clark, one year his senior and making his 10th appearance, who supplied the assist just before half-time.

Danns, the son of former Crystal Palace midfielder Neil and who only made his debut at Wembley, came off the bench to score the second in the 73rd minute which allowed Anfield to breathe a sigh of relief.

That allowed Klopp the luxury of sending on Trey Nyoni, who at 16 years and 243 days became the club's youngest player in the competition and third youngest in the club's history.

That was the signal for the party atmosphere to kick in with the Kop singing "we haven't won a trophy - since Sunday afternoon" - just before Danns fired home his second in the 88th minute after goalkeeper Joe Lumley parried Conor Bradley's drive.

Danns showed a composure belying his age by clipping a shot over Lumley after Will Smallbone's errant pass went straight to Elliott, before adding a late second.