I'd take Samba at this point. I've completely given up on Djourou now. OT on Sunday was the final straw.. that was an embarrassing attempt at defending from him.
Samba and Mertesacker to push Djourou out of a starting place and Squillaci even futher out of contention wouldn't be a bad thing. The only thing is, we need top class players and the names we are being linked to at the minute, that are realistic, aren't that. Samba, Benayoun, Malouda and Mertesacker would all be good additions collectively, but as individuals it's all very meh.
We need a spark, a lift and none of those players are gonna bring that.