So, the touch-paper has clearly been lit on West Ham United’s summer transfer window. Julen Lopetegui, Tim Steidten and the West Ham board have burst into life with a flurry of new signings over the past few days. Crysencio Summerville and Niclas Fullkrug were confirmed as Hammers players on Saturday and Monday respectively, whilst Guido Rodriguez should be announced today, taking the total of new arrivals to six. However, Lopetegui is far from finished, with the addition of a new centre-back and a right-back desperately needed. Logan Costa could well be the man for the job in the central defe…