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West Ham have completed the loan signing of Wolves defender Roger Johnson and he could go straight into the Hammers side for tomorrow's Capital One Cup semi-final against Manchester City. 

Sam Allardyce has moved for the centre-back, who has joined until the end of the season, as injuries to Winston Reid, James Collins and James Tomkins has left him short on defensive options. 

Johnson began his career with Wycombe Wanderers before joining Cardiff in 2006. He moved to Birmingham City in 2009 before switching to Wolves two years later.