Tomlin has left Arsenal and joined the Hammers after being informed he wouldn't be offered pro terms by the Gunners.
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The keeper, now 16, did make the bench for Arsenal's U18 team last season.
Tomlin was an unused substitute last weekend as West Ham’s U18s faced Crystal Palace.
The teen's arrival comes just weeks after Tom Wooster (Manchester United) and Reece Byrne (Newcastle) joined West Ham's U21 squad.