West Ham United are seemingly in the race to sign a top-class striker in the summer transfer window. Julen Lopetegui knows full well just how much work he needs to do on his West Ham squad this summer, but he needs to sign a proven striker more than anything else. The Spaniard is keen to bring at least six new signings to the London Stadium, and the addition of a new centre-forward is said to be one of his main priorities. Michail Antonio has been brilliant for the Hammers, but now is the time for Lopetegui to make a big upgrade on the Jamaica international. The West Ham boss cannot afford to …