Algeria international Said Benrahma's permanent move to West Ham United will be approved if he passes a second medical at the end of the 2020/21 season.
West Ham concluded a loan-to-buy deal on transfer deadline day but the agreement was done in a hurry following some unforeseen circumstances.
The deal was left hanging in balance because the Hammers medics discovered a hidden lung issue that raised concerns.
A recruitment source told Football Insider that Benrahma will be able to sign on a permanent basis if he passes the second medial with no issues.
Thereafter West Ham will have to pay his parent club Brentford an addition £12m, as well as up to £8m in add-ons if he commits his long term future to the club or is sold to another team.
The Hammers have been on a strict budget this season but their finances were slightly eased up by the loan move of Felipe Anderson to Porto as well as Jack Wilshere's recent departure.
The sales of Jordan Hugill and Albian Ajeti and goalkeeper Roberto's exit have also helped the club.