Ozil is likely to have played his final game for the Gunners after being dropped from their Premier League and Europa League squads this month.
The 32-year-old will continue to train with Arsenal, while Arteta’s decision was heavily criticised by the midfielder’s agent, who has accused the Spaniard of not being ‘fair, honest and transparent’.
Koscielny, who played alongside Ozil for six seasons at Arsenal, claims the midfielder is ‘always professional’ in training and is a popular member of the dressing room.
‘We’re both part of the ‘Arsene Wenger Generation’. The coach loved him as a player,’ Koscielny told L’Equipe.
‘It was more complicated with Unai Emery and Mikel Arteta.
‘Knowing him, he must always be professional in training, always on time.
‘He is undoubtedly at the level demanded by the Premier League.
‘There is probably a certain case with the club since last year, I hope both sides find a deal that works for everyone. He is a competitor.
‘I hope to see him back on the pitch soon, at Arsenal or elsewhere, because he is real talent.
‘He is a generous person, with whom I got along very well. As a player, he is in my opinion a phenomenon.
‘He can find passes that no one sees, he’s a maestro. He can rock a game with incredible passes.’