So, how much can West Ham United actually spend on new signings in the summer transfer window? The upcoming summer transfer window will be a vitally important one for new West Ham manager Julen Lopetegui. The Hammers boss is apparently eyeing up a big summer window, with at least six new signings being lined up. Meanwhile, the news that Lucas Paqueta has been officially charged by the FA for potential betting breaches rocked Lopetegui’s summer spending plans. Many expected the Brazilian to join Manchester City this summer in an £85 million deal (Goal), but that now looks unlikely with the char…