#3 Sergio Reguilón (Sevilla)
Sevilla have been highly effective in attacking from the flanks this season and most of their success can be attributed to their pair of highly skilled full-backs, Jesus Navas and Sergio Reguilón. They will play a crucial role against Manchester United tonight.
Though it is Navas who has made numerous runs from the right flank and sent in top quality crosses for his team, his partner at left-back Reguilón, will be a key man for them against Manchester United tonight.
The 23-year-old defender has been highly impressive in his loan spell with Los Palanganas and was La Liga's best left-back this term ahead of Alba and Marcelo.
One of the his bigest strengths is his reading of the game and concentration which means that he is rarely caught on the wrong foot. The young Spaniard is equally comfortable on both ends of the pitch, scoring three goals, providing four assists and also making 1.7 tackles per 90 and 1.4 clearances per 90 across all competitions. Manchester United will have to be focussed to thwart the threat from Sevilla's full-backs.
#2 Bruno Fernandes (Manchester United)
Not to sound cliched, but Manchester United's January signing Bruno Fernandes will likely be their most important player against Sevilla. The midfielder scored the winner in the intense quarter-final clash against Copenhagen in extra-time to take his tally to 7 for the season, making him the top-scorer at the tournament.
The player has breathed a new life into his side and since his arrival, there has been a steep improvement at both ends of the pitch for Manchester United as they have 13 clean sheets across all competitions since his first game and have found the back of the net 50 times.
He was as influential as ever in the quarter-final as well and was denied a goal in the second half as his speculative strike came off the post. Sevilla are a highly disciplined and solid defensive side and can suffocate Manchester United's forwards of service from open play.
Given that 13 of Bruno Fernandes' 27 goals in the 2019-20 campaign have come from the penalty spot he might have to adopt a different approach against Sevilla tonight to leave his mark and guide Manchester United to the final.
#1 Lucas Ocampos (Sevilla)
It's evident that the strength of both sides heading into the fixture is their defence, having conceded only four goals apiece throughout their respective campaigns. Against a stubborn defence, you need a tenacious forward with an eye for the goal but he should also be versatile to latch onto any opportunity that he can find.
In that respect, Sevilla's top scorer this season, Lucas Ocampos is one of the best players suited to thrive in a game like this. The Argentine winger has produced a return of 17 goals this season, including his first in the Europa League in their win over Wolves on Tuesday night.
He is one of Sevilla's fastest players despite his six foot two frame, he is also technically gifted and strong on the ball. Combine all that with his aggressive and direct style and you get a modern attacker who has all the abilities to wreak havoc in oppositon's defence.
He is also the player for big moments and scores goals at crucial moments for his team as 13 of his 17 goals this season have been decisive in terms of giving his side the lead in the game or have helped in mounting a comeback.
Manchester United cannot relax until they keep him in check and their ability to do so will have a pronounced effect on the outcome of the game.