Australian Test stars Billy Slater, Paul Gallen, Sam Thaiday and Daniel Tupou are among a host of big-name NRL players off contract with their futures unresolved beyond this season.

New Zealand internationals Sam Perrett, Sika Manu, Alex Glenn and Bryson Goodwin also remain unsigned for 2016, along with NSW Origin winger Will Hopoate and former Blues star Blake Ferguson.

More than 150 NRL players are yet to finalise deals.

Under NRL rules, players can negotiate with rival clubs 12 months before the expiry of their contracts on October 31, while they are able to sign with their current clubs at any time.

While Slater, Gallen, Thaiday, Glenn and Ferguson are expected to stay with their respective clubs, the fact that negotiations have been drawn out for so long suggests there is a chance they will not be able to reach agreement.