Amid an injury crisis at Arsenal, Hector Bellerin has been handed his first start in an Arsenal shirt.
It will be something of a baptism of fire for the 19-year-old right-back from Spain. The away match against Borussia Dortmund is arguably Arsenal's toughest test in the Champions League group phase.
He comes into the side following a long-term injury to Mathieu Debuchy and Calum Chambers' suffering a bout of tonsillitis.
Further forward, Arsene Wenger has picked a strong looking attack with Danny Welbeck spearheading the side in his first Champions League appearance since joining from Manchester United.
Mikel Arteta, Jack Wilshere, Aaron Ramsey, Alexis Sanchez and Mesut Ozil make up the midfield.
Szczesny, Bellerin, Koscielny, Mertesacker, Gibbs, Arteta, Wilshere, Ramsey, Alexis, Ozil, Welbeck
Subs: Ospina, Chambers, Rosicky, Oxlade-Chamberlain, Cazorla, Campbell, Podolski
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