Anthony Martial's next goal for Manchester United will set the club back £8.5m as part of the clause inserted into his contract when joining from AS Monaco.
The Red Devils paid an initial £36m up front for the France international in the summer of 2015, making him the most expensive teenager in world football.
A number of clauses were written into his contract at the time, however, with each milestone triggering a fresh payment from United to Ligue 1 leaders Monaco.
One of those clauses will see United hand over close to an eight-figure sum once Martial hits his 25th competitive goal for the club - Saturday's strike against Watford taking him within one of that tally.
Martial, who has started 16 games in all competitions this season, could set United back around £63m in all should he hit each milestone.
