Castleford have dropped the threat of legal action over Wigan's breach of salary cap rules after a meeting with the Rugby Football League.
Wigan were docked four points from this season's total but finished just three points ahead of relegated Castleford at the end of the last campaign.
Castleford chief executive Richard Wright said: "We have fully explored the issues with the RFL.
"We may not agree with everything but understand their difficult position."
Wright was angry that action was not taken in October 2006 by the RFL to avoid what he recently described as "one of the biggest injustices in the history of the sport".
Castleford finished above French side Catalans Dragons, who escaped the drop as they cannot be relegated in their first three years in Super League.
Last season was the second year in a row that Wigan had breached Super League's salary cap rules. Wright added: "At the end of the day, there is no rule that provides for compensation or remedy for us as a result of a salary cap breach.
"The rules only provide for penalties to be imposed on the club breaching the cap.
"As a result of our discussions and consultation with our legal advisors, we will trust in the process and are not planning to take any further action."
Castleford are in the frame for promotion from National League One this season and are hopeful of securing a place in Super League for 2009 when a franchise system is expected to be in place.
"We were realistic in our expectations," said Wright.
"We never expected to be re-instated in Super League but we did believe we had a good case for being given a Super League licence for 2009, possibly, subject to our new stadium project going forward.
"The RFL have not agreed to our request but they have explained the process that the licence system will follow and we are reassured that our relegation from Super League last year will not be a disadvantage to us.
"Our case for a licence is very strong across all the criteria and it will be difficult to find 12 clubs with stronger credentials than ours next March."
Meanwhile, Castleford coach Terry Matterson has signed a two-year contract extension, keeping him at The Jungle until at least the end of the 2009 season.
"We are really happy that we have been able to keep Terry at the club for at least another two seasons," said Wright.
"In his time at the Tigers he has shown himself to be a very accomplished coach, and we firmly believe that he is the man to take us forward."