West Ham United have completed the signing of goalkeeper Darren Randolph, making him the first new arrival at Upton Park this summer.

The 28-year-old recently turned down a new contract with Birmingham City after two years with the club in a bid to secure a chance at Premier League football.

Announcing the signing on the club's website, West Ham confirmed that the Republic of Ireland international will join on a free transfer from July 1 once his current deal with the Championship side expires.

Randolph kept 12 clean sheets in 45 league appearances for Birmingham during the 2014-15 season.