Clubs that will have no interest in him:
Broncos (Ben Hunt and Anthony Milford)
Raiders (Aiden Sezer and Blake Austin)
Bulldogs (Moses Mbye and Josh Reynolds)
Sharks (Chad Townsend and James Maloney)
Titans (Ash Taylor, Kane Elgey and Tyrone Roberts)
Knights (Trent Hodkinson and Jarrod Mullen)
Cowboys (Johnathan Thurston and Michael Morgan)
Panthers (Nathan Cleary and Te Maire Martin)
Rabbitohs (Adam Reynolds and Cody Walker)
Roosters (Mitchell Pearce, Connor Watson and Ryan Matterson)
Tigers (Luke Brooks and Mitchell Moses)
Current team the Dragons according to reports
That leaves four teams - the Sea Eagles, Storm, Eels and Warriors, who are not set in the halves for 2017 and may have some interest in his services at the right price.
Sea Eagles
The Sea Eagles are believed to be chasing Storm five-eighth Blake Green hard. It is expected he will go to the Northern Beaches next season so assuming that happens Marshall is down to three options. He could become an option for Manly should Green opt to sign elsewhere.
Storm
The Storm is likely to move exciting rookie Curtis Scott to the halves next season if Green leaves as a free agent as expected. They wouldn't want to pay much but if Marshall's motivation was to play first grade and money wasn't so much of a factor the Storm are a possibility and might be his best bet though that would mean a move away from Sydney.
Eels
The Eels are a mess and need to completely rebuild now that Kieran Foran has left and Jarryd Hayne isn't coming back in his place. Suspended half Corey Norman was playing well before his off-field indiscretions and is rumoured to be close to re-signing with the club. It is hard to see the Eels thinking of Marshall as a worthy stop-gap measure in what will clearly be a season or two of rebuilding their roster and their entire organization after a horror 2016. Marshall would hardly be motivated to play for a club in disarray and in rebuild mode whilst taking a big drop in salary at the same time.
Warriors
The Warriors might be the best fit for Marshall but they don't appear to be interested in him. They have a fairly settled roster but have an opening in the halves with Thomas Leuluai heading back to England at the season's end. Coach Andrew McFadden and managing director Jim Doyle have made it clear they see Tuimoala Lolohea as Johnson's halves partner next season but the versatile Lolohea is yet to be proven as a first grade half. With rookie Ata Hingano and 2015 rookie Mason Lino the only other halves at the club, there is a risk the Warriors will be caught short if the Lolohea experiment doesn't work.
Foran factor
The other thing to add to the mix here is that Foran is taking an indefinite break from the game. Should he be available to play in 2017 there would be a number of clubs interested in his services, which could add other halves to the free agent mix as well.