Julen Lopetegui has given the green light for West Ham to hold talks over a £12m deal and it can mean only one thing. West Ham are back on the transfer trail in a big way this week. After signing midfield star Luis Guilherme – who, according to the teenager himself, can play across all attacking positions – attentions have now turned elsewhere. New Hammers head coach Julen Lopetegui currently has 18 senior players in his squad including Guilherme. Veteran goalkeeper Wes Foderingham will make that 19. So West Ham still need another six signings to have the full complement of 25. That is not tak…