Napoli coach Carlo Ancelotti was left frustrated after their 3-0 Europa League win over Red Bull Salzburg.

Arkadiusz Milik, Fabian Ruiz and a Jerome Onguene own goal sealed the round 16 first-leg win.

“It's a good result, there are still 90 minutes to play and we cannot make calculations. We did some things well, some not so well, and we've got to work on those," Ancelotti told Sky Sport Italia.

“We allowed some dangerous counter-attacks and through runs that at 3-0 we really could've avoided. We can be impenetrable when we defend well, but we get too exuberant and try to push forward.

“Salzburg have proved they've got great pace and stamina, so we need to be on alert. We need to score at least a goal in the second leg, otherwise we'll run risks."