Both Tiki Barber and Terrell Owens would love to play in the NFL this year, but neither has gotten the opportunity to do so. Now that injuries have decimated some teams, both Owens and Barber might actually get a chance at a workout or two. That doesn't mean they will actually do anything of note this season.
While Owens actually had a solid campaign with the Bengals in 2010, he's coming off of ACL surgery and will turn 38 in December. Last year in Cincinnati, Owens finished with 72 catches for 983 yards and nine touchdowns. But if he were to latch on to a team this late in the season, the likelihood of him making an impact is very slim.
Even if Owens does come back, don't expect him to be a fantasy gem, since it would likely take him a lot of time to get acclimated back to the NFL game after spending so much time on the shelf.
As for Barber, it really doesn't look like anyone wants to give him a shot this year. He hasn't played since 2006, and five years out of the league have probably diminished his skills considerably. If a team were to take a chance on the three-time Pro Bowler, it would almost certainly not be as a featured back.
The best Barber could hope for would be a few token carries while being a deep bench option.
Realistically, neither Owens nor Barber should even be on your fantasy radar if they somehow find themselves back on NFL rosters.