Just a few years ago, Austin Collie was a promising NFL receiver.After being taken in the fourth round of the 2009 NFL draft out of BYU by the Colts, Collie put up some big numbers in Indianapolis.In 16 games as a rookie, he caught 60 balls for 676 yards and seven touchdowns. In a full season in 2011, he caught 54 passes for 514 yards and a score. And in just nine games in 2010, he had 58 receptions for 649 yards and eight TDs.But the former BYU receiver suffered several injuries with the Colts, including at least three concussions and a knee injury in 2012 that limited him to just one game and one catch. Now, as a 27-year-old free agent, he's looking to land with a new team – many of which are scared off by his previous concussions. Collie, however, told USA Today recently that he'd sign a waiver to clear any team of responsibility if he suffers another concussion."They're not going to have to worry about me suing," he told the newspaper. "I'll hold myself accountable."One team that reportedly still has Collie on its radar is the 49ers. Another is the Baltimore Ravens. But neither has made a move on Collie yet, with training camps set to open later this month.Marc Sessler...