I'd go 4-4-2
Szczesny
Sagna--CB--CB--LB
Winger--CM--CM--Winger
Podolski--Giroud
Sagna--CB--CB--LB
Winger--CM--CM--Winger
Podolski--Giroud
I'd rotate Koscielny, Vermaelen and Mertesacker at CB.
I'd rotate Gibbs, Santos and Vermaelen at LB.
I'd rotate Song, Arteta and Wilshere in CM.
I'd rotate Chamberlain, Walcott, Gervinho and Santos out wide.
Any injuries up front and I'd play five in midfield with Wilshere in the advanced role.