"Benji is a Club stalwart who will always be part of our history," Mayer said. "Unfortunately we are not in a position to offer him anything at the Wests Tigers, as he made a decision last year and we have had to move forward.
"We believe that the NRL is stronger with Benji Marshall and we will not stand in his way from returning to the competition.
"Benji will always hold a special place in out heart and we believe he would be a great addition to any Club in the future," he said.
On finalising a playing agreement with a new team, Wests Tigers will have a separate discussion with that Club on a set of terms that will be commercial in confidence.
Marshall played 201 games for the Wests Tigers before joining Super Rugby team Auckland Blues at the completion of the 2013 season.