As per Sky Sports, they have opened talks to sign the Amiens forward on a loan deal until the end of the season.
It seems that David Moyes wants to sign a backup for Haller. Guirassy has done well with Amiens this season and he could prove to be a solid addition.
West Ham have had a poor season so far and they will need to improve a lot during the second half of the season. New signings could freshen things up for them and galvanise the whole squad.
It will be interesting to see if they can agree on a deal with the French club.