He will be out until the worldwide break, confirmed Arsene Wenger "Danny has a scan today, we don't know how bad his groin injury is but he will certainly be out until the global break", Wenger said.
But the versatile forward will miss at least the next two Premier League matches for the Gunners, while he will also be unavailable for the Europa League trip to BATE Borisov.
Danny Welbeck will undergo a definitive scan on his injured groin today amid fears he could miss the next four weeks.
"Mesut [Ozil] is training again, but for tomorrow no [he will not feature]".
He's also unlikely to be available for England's final World Cup qualifiers against Slovenia and Lithuania.
Arsenal's first game after the internationals is against Watford on Saturday, October 14 at Vicarage Road.
The game is likely to be a chance for fringe players to make their mark - including returning midfielder Jack Wilshere. "He has a little inflammation of his knee".
Goalkeeper David Ospina, club captain Per Mertesacker, Mohamed Elneny, Ainsley Maitland-Niles, Theo Walcott, Alexis Sanchez and Olivier Giroud all started against Cologne before dropping out of the starting line-up for Sunday's draw at Stamford Bridge.
Defender Calum Chambers will be included against Doncaster.
The younger players will be hoping to be given a chance in the League Cup, a tournament manager Arsene Wenger has previously used to blood academy talent into first-team football.