The clubs were locked in talks over the striker’s future during the morning of deadline day, with the key factor his £350,000-a-week wages.
Browsing: Calum Chambers
The Hammers looked to be cruising towards a victory which would have seen them draw level with Chelsea in fourth after goals from Jesse Lingard, Jarrod Bowen and Tomas Soucek put them in complete control.
Arsenal suffered a huge injury blow on Thursday after learning Calum Chambers would be out for up to nine months following surgery on a ruptured cruciate ligament.
Late goals from Jorginho and Tammy Abraham completed a late turnaround as Chelsea stunned Arsenal 2-1 in the London derby at the Emirates Stadium.
The 23-year-old made 24 appearances for the club last season and has been handed a fresh contract ahead of the new campaign.
Stoke went into the game having not won since January 20
It looked as though Arsenal had edged a largely uneventful affair when Alexis Sanchez’s free kick deflected in off James McClean for an own goal, but it proved to be that all of the action was reserved for the closing stages.
The result keeps Arsenal in third, just a point behind Manchester City, while West Ham sit 10th
Chambers becomes the third player after Theo Walcott in 2006 and Alex Oxlade-Chamberlain in 2011 to swap the south coast for north London