Here are five of the biggest names of the Super League era to have also played for both teams across their careers...
5. Sean Long
The now-Oldham head coach won a total of four Super League titles and five Challenge Cups with St Helens, and was named Man of Steel in 2000 Photo: Chris Mangnall / SWPix
6. Micky Higham
The hooker enjoyed a long and successful career that included stints with St Helens and Wigan, as well as two stints with Leigh Photo: Ash Allen/SWpix.com
7. Micky Higham
Representing Great Britain and England, Higham made 115 appearances in Red V and 97 in Cherry & White Photo: Simon Wilkinson
8. Martin Gleeson
The centre scored twice in the 2010 Grand Final triumph over St Helens, whom he represented between 2002-2004, winning a Super League and a Challenge Cup Photo: Vaughn Ridley