Bradford underwent season-ending knee surgery in November with hopes of curing ligament damage, but the procedure might not have returned him to full fitness.
Less than a month later, Bradford would undergo a knee scope and was placed on injured reserve the next day on November 8. He suffered two ACL tears in 2013 and 2014.
The 2008 Heisman Trophy victor who grew up in Oklahoma City threw for 346 yards and three touchdowns in a Week 1 win over New Orleans, but suffered a hit that sidelined him for weeks, and a comeback was eventually cut short by knee surgery.
Bradford, 30, was acquired by the Minnesota Vikings from the Philadelphia Eagles following Teddy Bridgewater's season-ending injury before the 2016 season in exchange for a 2017 first-round pick and a 2018 fourth-round pick. Earlier he had tweeted that the figures the two sides were exchanging were in the area of $28 million per season. In his first season with the Vikings, he completed almost 70 percent of his passes, had 20 touchdown and only five interceptions.
Bradford enters his age-31 campaign and arguably has the highest upside of any of the available veterans this offseason.