West Ham welcome Julen Lopetegui’s compatriots Celta Vigo to the London Stadium in their final pre-season friendly on Saturday afternoon. After defeats to Wolves and Palace in the last two weeks, Hammers News stated the performances had piled the pressure on West Ham technical director Tim Steidten to make signings. And my how he responded. Crysencio Summerville, Niclas Fullkrug, Guido Rodriguez and – to be announced imminently – Jean-Clair Todibo have all arrived at the London Stadium. That is to add to West Ham’s acquisitions of Luis Guilherme, Wes Foderingham and Max Kilman. The Hammers are…