South Sydney will continue to fight for the services of superstar centre Greg Inglis despite the NRL on Saturday officially blocking his proposed move to the Rabbitohs for the next three seasons.

The NRL have advised Souths they must include the full value of a number of third-party agreements relating to Inglis's reported $600,000-a-year deal in the salary cap.

The latest development in the ongoing saga leaves Inglis - who reneged on a deal to sign with Brisbane when third-party opportunities failed to materialise - in rugby league limbo without a club for 2011.

Parramatta had been keen to lure the Test and State of Origin star to the Eels, but gave up the chase believing Inglis's move from Melbourne to Redfern was a done deal.

But the league's hardball stance may rekindle the Eels' interest, particularly now they have cash to burn following the departures of big-money three-quarters Timana Tahu and Eric Grothe Jnr.

The Rabbitohs, though, have vowed to continue pursuing the game's No.1 centre.

"The Rabbitohs will do everything they can to keep Greg Inglis in rugby league," the club said in a statement.

"The South Sydney Rabbitohs are disappointed and disagree with the decision ... (and) will assess their salary-cap position as determined by the NRL's salary-cap auditor (Ian Schubert) and make a decision on a path forward over the next seven days."

The NRL released a statement explaining that the rules are in place to "ensure that any third-party agreement is not in truth a vehicle to remunerate the player for playing rugby league at his club".

"Given the circumstances under which Greg became available to South Sydney, nobody can have been under any doubt about the importance of ensuring his contract complied with the cap," NRL chief executive David Gallop said.

"The NRL had already required the Broncos to include third-party agreements within their calculation of the contract value and was insisting legal fees also be included when those negotiations ceased.

"South Sydney had been advised to have all proposed offers reviewed by the NRL before making any commitments.

"They chose not to do so and it has taken some time to access all details of the agreements.

"It is unfortunate for Greg that he is in the middle of a difficult situation and I assured him this week that these issues do not reflect on him but that they are matters for clubs in assessing the offers that they make.

"He is one of the game's most highly valued players and we have assured him of that in no uncertain terms.

"That said, the cap has to apply fairly to all clubs and one club cannot be allowed to do what others were prevented from doing.

"The rules on third-party deals are clear.

"We have worked with clubs and players by substantially increasing the amount that sponsors can pay players through the $300,000 marquee player allowance in 2011, but without rules on third-party agreements there would be no point in having a salary-cap system."

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