Blue Square Bet
Published 10th August 2012
The 20-year-old enjoyed a loan spell with `Port towards the back-end of last season, scoring twice in six appearances.
Stephenson still had twelve months left on his contract with City but he was told by manager Phil Parkinson in May that he was free to find a new club.
The Jamaican-born striker has had previous loan spells in non-League football with Silsden, Hinkley United, Stockbridge Park Steels and Woodley Sports.