West Ham United must spend big if we want to sign a top-class left-back in the January window it seems. The January transfer window will be a vital one for West Ham, and David Moyes needs to sign a new left-back to compete with Emerson Palmieri. The Hammers manager has only Aaron Cresswell as cover for the Italy international, and the 34-year-old quite simply shouldn’t be playing Premier League football anymore. One player who West Ham have been linked with persistently over the past few months is Chelsea left-back Ian Maatsen, and the 21-year-old recently admitted that he could be open to lea…