Their £72million record signing bagged a stunning opener in the 3-0 win over the Molde on Thursday side but the die has already been cast.
He won't feature in today's Premier League fixture against Wolves - or in the subsequent clashes with Tottenham and Burnley - following a red card last weekend.
The Ivory Coast international, 25, was sent-off in the 0-0 draw at Elland Road for headbutting Leeds left-back Ezgjan Alioski.
Behind the scenes the Gunners are ready to offload £140k-a-week Pepe if a suitable buyer can be found.
The former Lille man has been working hard in training but there are growing concerns that he's not cut out for the Premier League.