Ia tusia se faaauauina o lenei palakalafa - I le 1991, na filifilia ai Gratton lona tolu i le OHL Priority Selection e le Kingston Frontenacs. Ina ua maeʻa lana tausaga amata i le OHL, na maua ai e Gratton le Emms Family Award o le rookie o le tausaga. I le 1993, na filifilia ai o ia i le tulaga tolu i le NHL Draft
e le Tampa Bay Lightning.