West Ham’s summer transfer window has burst into life with five deals worth £100m in progress and there’s money to spare. Julen Lopetegui does not officially start as West Ham’s new head coach until July 1st. But he has been working hard with Hammers technical director Tim Steidten behind the scenes to plan a much-needed West Ham overhaul. As things stand Lopetegui will have just 16 senior players available to him in pre-season. The Spaniard – unlike his predecessor David Moyes – wants a full squad of 25 players to work with at West Ham. So at least eight or nine signings are needed this summe…