The CS is not trophy in any case, it's little more than a glorified friendly. Arsenal played it every year nearly 1998-2005 and I can scarcely remember a single one properly.
I'd play
Szczesny
Debuchy Chambers Koscielny Gibbs
Ramsey AOC
Sanchez Wilshere Cazorla
Giroud
But inevitably, Arteta/Flamini will start.
*Felt Chambers acquitted himself well at CB this w/e btw.