Pierre Emerick-Aubameyang says racism "is not good for football in England" and admits suffering abuse is "really painful".
Aubameyang had a banana skin thrown in his direction during the north London derby in December and the Gabon global expressed frustration when quizzed on the subject following the 2-0 win over Napoli.
"I think that the second half was completely different", Ancelotti said. On Monday, I am sure we are going to play different players but [try] to find the same performance.
Arsenal won the match 2-0 courtesy of goals from Aaron Ramsey and Lucas Torreira, but the result has been overshadowed by the latest in a series of racist incidents involving supporters of English clubs.
They have lost both away knockout ties in this season's Europa League to BATE Borisov and Rennes, two teams not considered as strong as Napoli - who sit second in Serie A.
"I think we played well last night and it was important to win", he added.
"Now we will go to Napoli with a lot of confidence and we will go there to score goals".
"We are happy with our performance but we know that nothing is decided, it's not over yet". We have to improve that.
"If you win there I think you send a message to everybody".
Reflecting on the result, Emery said: "50 per cent [happy] because we know the first leg was very important for us to take a good result and a good feeling with our supporters with this competition".
"We're going to prepare for Monday first, and also recover the players after the game today thinking that we are going to play a lot of matches [every] three days".