Arsene Wenger is set to ring the changes for the visit of the German side.
Cologne are struggling at the foot of the Bundesliga and Arsenal are set to rest a host of senior stars for the European clash.
The Evening Standard report Aaron Ramsey, Mesut Ozil, Alexandre Lacazette, Laurent Koscielny, Granit Xhaka, Petr Cech and Danny Welbeck all missed an open training session at the club’s training ground this morning.
David Ospina, Jack Wilshere and Theo Walcott are all likely to play tomorrow with the seven key players all appearing unlikely to start.
Arsenal travel to London rivals Chelsea in a crunch Premier League clash on Sunday and Wenger is likely to have an eye on that game ahead of tomorrow’s Europa League clash.
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