Arsenal keeper Petr Cech says his side made a “very difficult” trip to Napoli “look easy” to seal a 3-0 aggregate win and reach the Europa League last four.
Alexandre Lacazette’s first-half free-kick into the top corner earned victory on the night after the hosts had had the better of the early chances.
“We controlled the game really well and defended really well too,” said Cech.
The Gunners will host Valencia in the first leg of their semi-final on Thursday, 2 May (20:00 BST kick-off).
Cech, who is retiring as a player this summer, saved well from Jose Callejon, while Arkadiusz Milik had a goal ruled out for offside – but otherwise the Serie A side struggled to make an impression.
“Napoli are a fantastic team who always score a lot of goals, especially here at home, so to keep two clean sheets is obviously something [positive],” added the 36-year-old Czech.
“It was a very difficult game but we made it look easier because we played really well.”
It ensured a comfortable night’s work for the Gunners as Unai Emery marked his 50th game as their manager.
Arsenal, who arrived at the Stadio San Paolo with a 2-0 lead from the first leg at Emirates Stadium, could have doubled their margin of victory on the night but home goalkeeper Alex Meret superbly saved from Pierre-Emerick Aubameyang after the break.
The only negative aspect of the evening for Arsenal was Aaron Ramsey hobbling off with a suspected hamstring injury.
