Dimitri Payet backed West Ham into a corner last month and pushed the club into selling him to Marseille.
The France international was the club's star player last season, winning over fans with a slew of assists and genuinely dazzling free-kicks.
West Ham United's Dimitri Payet in action with Manchester United's Michael Carrick
His exit is a boost for West Ham's rivals, but for one player of Tottenham Hotspur, it could have negative implications.
Clinton N'Jie is on loan at Marseille for the season from Tottenham, sent out after a disappointing 12 months at White Hart Lane, as part of a deal which saw the so far equally frustrating Georges-Kevin N'Koudou sign for Spurs in August.
N'Jie has had an inconsistent spell for Marseille, who sit in sixth in Ligue 1, 16 points off the top.
He has scored three goals, but has been selected to start in only eight games of 16 league games he has been eligible for.
Tottenham's Clinton Njie during training
The winger is currently absent at the African Nations Cup, where he was been dropped to the bench for Cameroon after a disappointing start to the tournament, hardly ideal.
When he returns he will find it even tougher to establish himself in the Marseille team due to Dimitri Payet's arrival, with the ex-West Ham ace a guarantee starter.
Former Newcastle flop Florian Thauvin is in the mix for selection, and N'Jie faces a big challenge to prove himself over the back end of the season.
If he cannot then Marseille are less likely to want to sign him permanently, and re-establishing himself at Spurs will be just as tough.