The only thing I'd lay at Lampard's door is the signing of Alli - that was one horrific waste of a squad place. I know he wasn't officially in the club during the window, but he surely seen the situation in the defence at CB and CM.
Alli is a spare arse part.
I doubt he was involved. Wasn't he appointed like a couple of hours before the deal was done?
If he had wanted Alli, then we'd have seen Alli play regularly I think