Lewis Cook made his England debut in the 1-1 draw against Italy on Tuesday and netted his grandfather £17,000.
The 21-year-old's debut earned his grandfather Trevor Burlingham a hefty windfall after he placed a £500 bet in 2014 on his grandson winning a senior Three Lions cap before turning 26.
Just a matter of months after leading the Young Lions to Under-20s World Cup glory, the Bournemouth midfielder was drafted into the senior squad for the first time last November.
Cook did not make an appearance then, but won his first senior cap for England against Italy in the final friendly before Gareth Southgate names his provisional World Cup squad.