The Hammers had been keeping an eye on the forward’s progress, after he managed 16 goals in 20 appearances for Dutch second division club De Graafschap this season.
Portuguese giants Benfica had also been credited with an interest in the forward, with reports in Portugal claiming they were set to make a move before Friday’s transfer deadline.
But now according to sources in France, Nantes are ready to beat both to the forward’s signature, and are set to seal a deal before the end of the week.
The Ligue 1 club are understood to have agreed a fee with De Graafschap, with the forward set to sign on a four-and-a-half year deal.
The news will come as a blow to Sam Allardyce, who is still looking to add one more striker before the transfer deadline.
Allardyce has added Roma forward Marco Boriello so far this month, while Andy Carroll made his first start of the season in the goalless draw against Chelsea at Stamford Bridge last night.