But without being able to pick up test match assembly fees and also having taken a serious pay cut this year, it is likely Williams has been made an offer by Toulon that he simply couldn't refuse.
Toulon currently have Carl Hayman, Chris Masoe, Bakkies Botha, Jonny Wilkinson and Matt Giteau on their books.
Owned by the notoriously volatile and exuberant Mourad Boudjellal, Toulon are renowned as one of the best paying clubs in world rugby.
Hayman reportedly signed a three-year deal worth $1.5 million a season when he committed.
The club released the news late tonight - saying Williams will be replacing former England lock Nick Kennedy, who unexpectedly asked to be released from his contract with the French giant.
- With Newstalk ZB