But the Dolphins are just one of several teams interested in Fair, who surprisingly was released by the Lions on Sunday.
Fair has started 10 games or more in each of his four NFL seasons, but he did miss the last four games of the 2001 season after suffering a foot injury.
As for Harrison, the plan is to take a good look at him at practice for a while to see how he compares with backup cornerbacks Jamar Fletcher, Ray Green and Omare Lowe.
Harrison is a good playmaker at cornerback, but he does not have great speed.
Another name that had been mentioned as a possibility was former Dolphin Terrell Buckley, but it's becoming pretty apparent that nothing is going to happen along those lines. Buckley had a pretty rough training camp and preseason with the Bucs, which is why they wound up releasing him.