West Ham United enjoyed a terrific summer transfer window, and Paul Merson was very impressed by one of our new signings in particular. Julen Lopetegui worked wonders at the London Stadium during the summer transfer window, bringing nine fantastic new signings to West Ham. And Paul Merson has absolutely lauded one of the Hammers’ new signings. We learned a lot during the transfer window about how Lopetegui plans to take this great club forward. The main thing for me is that West Ham are now operating like a proper football club in the transfer window. It’s not just the fact that we made some t…