West Ham United have made an ‘official offer’ to sign a winger who David Moyes has already lauded as a ‘big player’. It looks set to be a busy summer for the Hammers as Julen Lopetegui goes about shaping the current squad in his image. The former Wolves boss will have big shoes to fill at the London Stadium as he replaces the man who guided West Ham to their first European trophy in 58 years. West Ham’s current crop of players is very much a Moyes squad after the Scotsman was backed significantly over the past four and a half years. The east Londoners are expected to target attacking reinforce…