An NFL source told the Post while Manning is interested in the Broncos, he is also being courted by the Tennessee Titans. No agreement was imminent.
Another source told the Post Titans' owner Bud Adams has offered Manning a "contract for life," and the Broncos will need to up their offer if they like what they see Friday.
The Miami Dolphins and the Arizona Cardinals earlier had been reported interested in Manning but appear to have moved on, the newspaper said.
Manning was released from the Indianapolis Colts March 7 after missing the 2011 season with neck injuries.