Lewis Cook made his senior England football debut in the 1-1 draw against Italy on Tuesday and netted his grandfather $A27,000.
The 21-year-old's debut earned his grandfather Trevor Burlingham the hefty windfall after he placed a $A800 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.
That bet at 33-1 with William Hill earned Cook's grandfather the cash - a princely sum but small fry compared with the $A201,000 won by Peter Edwards after grandson Harry Wilson made his Wales debut in 2013.