However, the forward has struggled to make an impact at the London Stadium – scoring just once.
His erratic form means West Ham are looking to loan him out for the remainder of the campaign.
Leeds United expect to seal the signing of Ashley Fletcher
Ashley Fletcher has scored just once for Leeds United – against old club Manchester United
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And the Daily Mail claim Fletcher looks set to join Leeds before Tuesday's transfer deadline.
Manager Garry Monk is said to be a fan of the player's work rate.
The Leeds boss also believes Fletcher can boost their bid to secure promotion to the Premier League.
Leeds also remain interested in Sergi Canos
The deal is likely to go through once West Ham seal the signing of Brentford star Scott Hogan.
Leeds also remain interested in signing Norwich midfielder Sergi Canos.