According to The Sun, the 16-year-old breakdancer will play a sixth-former named Kyle in the next series of the programme.
A show source told the newspaper: "We really wanted George as he has loads of young fans. It's fair to say his character will be attracting the ladies.
"He'll be a regular and the plan is for his scenes to be on air during the second part of series six later this year."
Sampson is said to be currently learning lines for his first episodes and is expected to begin filming soon.
The star won the second series of Britain's Got Talent in the summer of 2008. As well as securing a part in West End show Into The Hoods, he went on to release a single and dance DVD.