Arsenal boss Mikel Arteta says he feels he has "failed" with midfielder Mesut Ozil after leaving him out of his 25-man Premier League squad.
The German, who had also been omitted from the Europa League squad, can now only play for Arsenal Under-23s until his deal expires in summer 2021.
The 32-year-old, who joined Arsenal for a then club record £42.4m in 2013, has not played for the club since 7 March.
"My conscience is very calm because I have been really fair," said Arteta.
"What I can say from my side is that it is just a football decision.