London:
Allardyce says on the second-tier club's website that "we're close to the George John deal, which is progressing."
The 24-year-old center back is expected to initially move to Upton Park on loan with an option for a permanent transfer.
John's agent, Ted Philipakos, says on his Twitter feed: "Look for announcement today re USMNT and FC Dallas defender George John move."
West Ham is second in the League Championship standings, behind Southampton on goal difference.
Topics mentioned in this article
Mark Hughes
Alex Ferguson
Manchester City
West Ham United
Football
Chelsea
Arsenal
English Premier League
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