Mikel Arteta admitted Arsenal are in a "really dangerous circle" but has denied overtraining his players as the club's injury crisis heightened with teenager Max Dowman ruled out "for weeks".Arteta said 15-year-old Dowman suffered an ankle injury during a behind-closed doors friendly on Saturday.The teenager has been withdrawn from Arsenal's Champions League squad, meaning he cannot play in the competition again until the knockout stages.

Mikel Arteta admitted Arsenal are in a "really dangerous circle" but has denied overtraining his players as the club's injury crisis heightened with teenager Max Dowman ruled out "for weeks".Arteta said 15-year-old Dowman suffered an ankle injury during a behind-closed doors friendly on Saturday.The teenager has been withdrawn from Arsenal's Champions League squad, meaning he cannot play in the competition again until the knockout stages.