Baker is terrible at left back, it's just not his spot. I don't know if Clark's any better as I haven't seen him in that role yet, but at least Clark has a little attacking instinct, good passing ability, and a bit more pace than Baker. Baker is not comfortable going forward and doesn't have the pace to get back. I'd like to see Clark tried out there, if we're assuming Luna and Bennett are both still out.
I hope that Lambert doesn't go for the 5-at-the-back again. It was much much too defensive vs. West Ham and would be similarly overkill vs. Cardiff at home. If the fullback injury problems make a back four problematic, what do people think about trying out an attacking 3-4-3 formation? Something like:
Guzan
Vlaar - Baker - Clark
Bacuna - KEA - Westwood/Sylla* - Delph
Helenius - Benteke - Tonev
I think Delph would do well over on the left, both in an attacking and defending capacity. Although his form has been not great so far, I think I'd favor Westwood in this formation vs. Cardiff, as we'll be looking to keep the ball and he's about the best passer we have. Sylla might be better deployed there if we need a little more steel against more physical teams, or maybe as a late sub to help protect a lead.
Ideally the front three would be Weimann and Gabby with CB provided they're all fit and firing. I'm not sure yet how Kozak and Benteke together are going to work. But with Helenius and Tonev up front with Benteke, we've got some pace and industry (Tonev) and some trickery/skills (Helenius). I think it could work.
I think a 3-4-3 could work, but with Gabby and Andi. If they're not fit, how about 3-5-2? Benteke with Gabby or Helenius if he's not fit. Both Sylla and Westwood in.
I don't think Baker's that hopeless at LB. If we play 3-5-2 he can stay back and not go forward at all. Clark just doesn't look like a full back to me.