FA Cup finalists Watford were already shorn of the man who helped book their place at Wembley against Manchester City next month as Gerard Deulofeu missed out through injury and Javi Gracia's side did themselves little favours early on.
The Gunners are in the thick of a four-way battle for two Champions League qualification spots in the Premier League and have one foot in the Europa League semi-finals after earning a 2-0 quarter-final first leg win over Napoli on Thursday.
"We operate a zero tolerance approach, and anyone behaving like this is not welcome at Arsenal and will be banned from matches", comment the club adding that supporters are "encouraged to report any incidents as they happen to stewards or via our matchday alert service", the statement continued.
"Our goal, we worked to push the goalkeeper when he wanted to play like he was playing and I think it was a very good action from Aubameyang".
Watford's focus now returns to the Premier League, with Arsenal visiting Vicarage Road on Monday night, live on Sky Sports Premier League.
The Spaniard said: "I try to choose the best players for the next game".
"If you have the players we have, it's easy because they know the next games are very important for us", said Gracia. We don't have only one final - we have seven finals.
"They are going to demand a lot from us on Monday, but it is a good match and I appreciate it a lot, and I want to play matches against Javi Gracia and Watford because I think they are doing a big season".
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He did however announce the appointment of a new NISS head after the intelligence agency's chief Salih Ghosh resigned on Saturday. The AU echoed the protesters' demands, calling the military intervention a "coup d'Etat, which (the PSC) strongly condemns".