He came through the ranks at the Mayfield and Wigan St Jude's amateur clubs and was acquired by Warrington Wolves as a youngster along with Paul Sculthorpe and Iestyn Harris.
Fletcher is also a fan of rugby league; growing up, he was a fan of Paul Sculthorpe and Kelvin Skerrett as they were both from Oldham, and he makes occasional appearances at testimonial matches of famous players.
Educated at Counthill School, he started his professional career with Warrington Wolves as a 20 year-old, and shortly after that made his debut for England.
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Sinfield starting his playing career at Waterhead A.R.L.F.C., who also produced talent such as Barrie McDermott, Paul Sculthorpe, Danny Sculthorpe, Paul Highton, Lee Jewitt, Marc Sneyd, and Gareth Owen.