Slaven Bilic's claret and blue revolution has begun - with the signing of Sampdoria's exciting young midfielder Pedro Obiang.

95% that we will announce our first big signing of the summer tomorrow. — Jack Sullivan (@jsullivanwhu) June 9, 2015

Obiang is expected to be unveiled by the club as the first new arrival since Bilic's appointment was confirmed earlier this afternoon (Tuesday).The uncapped Spaniard will cost West Ham in the region of ?4.5million and is set to be announced as the club's first (new) signing of the summer, following successful negotiations between his current club and West Ham.Obiang, who passed a medical earlier today began his career with local club Athletico Madrid but moved to Italy in 2008 to join Sampdoria, for whom he has made in excess of 100 first team appearances.