Manchester United's dramatic 3-2 victory over Newcastle last Saturday cost the club £7.7million, SportsMail reports.
However, the same report suggests that Monaco have missed out on a further windfall as the 22-year-old will not rack up 25 appearances for the France senior side before the end of this season.
And it just so happens that the goal triggered a clause in United's agreement with Monaco that stated they would have to pay an additional 10 million euros for the striker if he bagged 25 league goals in his first four seasons.
United parted with £38.5m in two installments to sign Martial, but the deal included plenty of lucrative bonuses, which meant it could have eventually cost as much as £61.6m. Goals from Juan Mata, Anthony Martial and Alexis Sanchez helped Manchester United to complete the comeback. The Red Devils are now 8th in the Premier League table, seven points behind the league leaders.
The French club had a longer wait than they might have expected for the additional sum, though, since Martial had been stuck on 24 league goals for more than eight months.
Monaco will also be paid add-ons of €10m if Martial reaches 25 caps for France - he's now on 18 - and if he is nominated for the Ballon d'Or.