Arsenal boss Unai Emery declared himself "proud" of his players after defeating Napoli 1-0 in Italy for Thursday night's Europa League quarterfinal second-leg.

Arsenal reach the semifinals 3-0 on aggregate.

Alexandre Lacazette's 25-yard effort flew into the top corner after the hosts enjoyed the better of the early chances.

Arkadiusz Milik had a goal ruled out for offside while Petr Cech saved well from Jose Callejon.

Arsenal are scheduled to host Valencia in the first leg of their semi-final on Thursday 2 May.

Emery said: "I am proud of the players. We started very well. The first half was good because after we scored we continued not to give them opportunities. We defended well second half. In the two matches we can be happy to win against Napoli."

On semi-final opponents Valencia, he added: "They are a very good team with goods players. It will be a difficult match for us."

Aaron Ramsey suffered an injury setback and Emery said: "It is a muscular injury. Normally it will be some weeks out for him. But we have other players and we can find a performance and rotate players."

Asked if Ramsey has played his last game for Arsenal, he responded: "I don't know".