West Ham United are acting efficiently and ruthlessly in the summer transfer window it seems. Julen Lopetegui has already brought three new signings to West Ham in the form of Luis Guilherme, Wes Foderingham and Max Kilman. Next up for the Hammers boss this summer will most likely be the addition of an exciting new centre-forward. It has been claimed that Aston Villa striker Jhon Duran could be the man for the job at the London Stadium, after West Ham lodged a big-money bid for the Colombian. Granted, the signing of a top-class striker should be Lopetegui’s main priority between now and the en…