Arsenal beat Napoli 1-0 (3-0 on agg.).
Valencia beat Villareal 2-0 (5-1 on agg.).
The two sides will play against each other on May 2 & May 9.
Chelsea will battle against Eintracht.
On Thursday, Arsenal beat Napoli 1-0 at Stadio San Paolo following their 2-0 win in London and, therefore, proceeded to the Europa League semi-final where Unai Emery's men will face Valencia.
At the same time, Valencia left no chances to Villareal defeating the La Liga rivals 2-0 at Mestalla and finishing with a 5-1 advantage on aggregate.
Portuguese attacker Goncalo Guedes was the brightest player of the encounter as the 22-year-old scored a brace in the 3-1 win at Estadio de la Ceramica and provided an assist in the second leg.
UEFA Europa League
🚨 RESULTS 🚨
🔵 Chelsea claim 7-goal thriller
⚪️ Frankfurt through on away goals
🦇 Parejo on the scoresheet as Valencia win
🔴 Lacazette with the only goal in Naples#UEL
As per the competition's draw, the first leg of the Gunners' battle against Marcelino's crew will take place on May 2 while the reverse fixture is scheduled for May 9.
In Spain, the Bats have been average and are currently sixth in the table, 25 (!) points behind Barcelona and 12 points behind 3rd-placed Real Madrid with 6 games to go.
Elsewhere, Chelsea beat Slavia 4-3 at Stamford Bridge (5-3 on aggregate) in an extremely unconvincing fashion and will now go head to head against Eintracht.
The German Eagles, to a certain extent, surprisingly came back from the 4-2 loss at Benfica with a 2-0 triumph at home and knocked out the Portuguese Eagles from the competitions thanks to the away goals rule.