Things are very good indeed at West Ham United right now, but there’s still one major concern that needs to be addressed. Julen Lopetegui came into the London Stadium six weeks ago to replace the recently departed David Moyes as the new West Ham head coach. The Spaniard has hit the ground running as well, with the signings of Max Kilman, Luis Guilherme and Wes Foderingham already secure. Now deals for Niclas Fullkrug, Crysencio Summerville, Aaron Wan-Bissaka and Guido Rodriguez are believed to be close to being completed. What a transfer window it has been for the Hammers so far this summer, a…