League owners have made no decision about expanding to a 33rd team or moving a troubled franchise to Los Angeles when and if they come to an agreement on a stadium there.
Indianapolis owner Jim Irsay, who is involved in discussions with community and state leaders about improvements in the Colts' situation, said he was confident of working out a new deal to remain in Indiana.
"This is clearly on the frontburner," he said. "More and more we're trying to get people behind this thing.
"I'm 44 years old, I'm not signing until I'm 74 years ... unless I know we have a strong, long-term plan," Irsay said.