Love Rugby League understands Walker is considering move to the UK next year.
The 26-year old made his NRL debut for the Rabbitohs this season. He has scored two tries in six appearances.
A Gold Coast Titans junior, Walker joined Penrith in 2010 and played for the club’s NSW Cup team.
The halfback or five-eighth spent several seasons in the Queensland Cup and won the competition’s player of the year award in 2013.
He signed for the Melbourne Storm at the end of 2013 and joined Souths in June 2014.