Yes weak, we have Valencia as a RB and two CB's who I don't have a lot of faith in when they are under the pressure.
Also your point about Carrick isn't really true, he's been back few weeks now just on the bench. I was more referring to Herrera though.
We have to remember that everything is built on a solid foundation, right now we don't have that, especially when we are playing make-do RB's.
I hope I'm wrong, but for me it's not a good team on paper, only 1 player is in a bit of good form.. Fellaini, but I wouldn't of started him today.
Shaw, Blind, Di Maria are all in good form. They have carried better form than Fellaini
As for solid foundation have you seen city's clean sheets and defending?
And his point about Carrick is true. Being on bench =/= fully match fit. There is a reason hes been playing under 21s