A combination of money and a desire for a more balanced team led to Lyon accepting Tottenham Hotspur's latest offer.
Lyon president Jean Michel Aulas was later quoted by Eurosport admitting a deal was close to being finalised between the two clubs.
Aulas had previously been adamant he would not be swayed by Spurs, reported by Goal in late July to have said they have no intention of selling.
So what has changed his and the club's mind?
According to magazine France Football, the reasons for the U-turn are three-fold.
The first is that Tottenham's bid was considered by the club to be a significant sum for a player who has just one solid season on his record. It's a gamble to let him go, but regression next season would see them regret not cashing in.
It is also the case that Lyon can put the money to good use. They are looking for a centre-back to partner Samuel Umtiti, and believe the cash received for N'Jie can help fund a bid for either Marseille's Nicolas Nkoulou or Roma's Mapou Yanga-Mbiwa, formerly of Newcastle United.
Thirdly, the recent addition of Mathieu Valbuena increases competition for the attack. Lyon already have Alexandre Lacazette, Nabil Fekir, and do not want Claudio Beavue to feel pushed out. They believe cashing in on N'Jie will help them out in this area.
It appears Spurs have timed their offer just right, with Lyon's own aims aligning with a view that it is practical to sell N'Jie.
Tottenham's decision to stay patient over the course of the summer will hopefully prove a wise one.