The Premier League giants tracked Henderson from the age of ten , they 've had him training with the club 's biggest stars .
Giants 've been eager to get Henderson playing in the Football League before Henderson 's even turned 20 .
The Premier League giants tracked Henderson from the age of ten , they 've had him training with the club 's biggest stars , and they 've been eager to get him playing in the Football League before he 's even turned 20 .