Manchester United will be due a bumper windfall if West Ham qualify for the Champions League.
The Sun says United will land a huge cash bonus if West Ham join them in the top four this season.
The Hammers have had a stunning season and are only six points behind rivals Chelsea with a game in hand.
The England winger has been a big part of that success during a stunning loan spell at the London Stadium since January.
And there's a clause in his deal which will net United a £500,000 bonus if they secure Champions League football.
The agreement could help West Ham seal a permanent transfer for the 28-year-old, who is valued at around £20m.
His £100,000-a-week wage demands are proving an issue for the Hammers, especially if they don't get into Europe.