The match was duly suspended and restarted on Wednesday, with a new set of officials in place. PSG ran out 5-1 winners.
And asked if he would support his players walking off the pitch in protest of racism, Arteta replied: “Absolutely.
“If the players believe that is the right thing to do I would be right behind it.”
Speaking about events at the Parc des Princes, Arteta said: “Obviously it was very surprising. I could not hear exactly what happened, but I’ve seen the incident.
“After I saw the reaction and the unity that both teams showed. I am sure if something really happened that Uefa will investigate the actions really carefully, because we have done a lot of work in recent years to try to avoid this kind of behaviour in football.
“And I think it was a very strong message.
“I don’t know if they (the Arsenal players) have done [discussed] it in the dressing room.
“We have done around the club and with our staff because it is an incident that obviously has a lot of attention in the media and around our industry.
“As I said, I hope that Uefa investigate the action really well and let’s see what happens from there.”
Uefa said in a statement that “a thorough investigation will be opened immediately” and Coltescu faces the prospect of a minimum 10-game ban if found guilty of using racist language.