However, in a big day for the NRL, Abdo revealed to AAP that expansion to an 18th team before the deal ends is still possible if the game believes it is profitable.
However the season's format could still change again during the life of the deal, if the NRL believes it can pursue an 18th team and a ninth game each round.
"If we do expand, we will revisit [the TV rights] cost," Abdo said.
"Of course it is [possible an 18th team could come before 2028], absolutely. It's not out of the question.
"If the commission is satisfied with the business case for expansion, then we will sit down with our partners.
"The business case has to make sure the incremental investment covers what the cost is and adds value for everyone."
NRL secures a new bumper five-year deal with Nine, while expansion to an 18th team is still possible before 2028.
www.abc.net.au