The Reds’ preparations for their biggest game of the season so far have been hampered significantly by an injury crisis in Klopp’s ranks.
This left Klopp with just 18 senior players, including three goalkeepers, and this saw a clutch of call-ups from Liverpool’s under-23s ranks.
Conor Masterson, Nathaniel Phillips, Herbie Kane, Curtis Jones and Rafa Camacho were all part of training, and it is likely at least one will be on the substitutes’ bench at Anfield.
Only Masterson was registered as part of the Reds’ initial squad for the knockout stages, but a further addition could have been made by 11pm on Tuesday night.
So what do we know about the five youngsters who could play a part tonight?
Signed as a promising 16-year-old from Irish outfit Lucan United, Masterson is a cultured centre-back who has made swift progress through the ranks in recent years.
Captain of Neil Critchley’s U18s last season, he made the step up to the U23s along with his coach in the summer, and has been a regular fixture at the heart of the defence this term.