Sam Allardyce has brought in a new striker [GETTY]
The Hammers currently have Carlton Cole as their only recognised forward, with Andy Carroll still a couple weeks away from a return.
Gordon, who made his first team debut for the Posh last September, aged just 16, has made seven appearances for the League One outfit.
Gordon was also instrumental in Peterborugh's FA Youth Cup run which saw them reach the fourth round against Arsenal before agreeing terms with the Hammers.
West Ham take on Fulham tomorrow in a must-win clash.
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