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Arsenal appeared set to go in at half-time deservedly ahead following Nicolas Pepe's opener, only for David Luiz to concede a penalty following a challenge on Willian Jose.
The Brazilian centre-back was shown a red card by referee Craig Pawson following a VAR check, though Arteta insisted he could not see any contact after studying replays of the incident.
Ruben Neves converted from the spot before Joao Moutinho's long-range strike put the hosts ahead shortly after the break, with any hopes of a fightback disappearing for Arsenal when goalkeeper Bernd Leno was given his marching orders for handling the ball outside the area.
For Arteta, though, it was the David Luiz call that left him frustrated, particularly after his side had played so well up until that crucial moment in the contest.
"I have to say that I'm proud of my team, the way we played and the way we dominated the first half," Arteta told the media.
