Bradford, who was placed on IR on November 8 with a left knee injury, returned to practice last week and completed his fifth practice Friday. With the decision, the Vikings also waived tight end Kyle Carter.
Bradford's activation does not guarantee he will be among the 46 active players Sunday, and it's unclear whether Bridgewater will continue to back up Keenum as he has been doing since Week 10 or whether the Vikings will turn to Bradford now that he is back on the active roster.
With Bradford missing almost the entire regular season, Keenum stepped in and enjoyed the best year of his career.
Bradford hasn't played in a game since then, and went on injured reserve November 8 after having his third operation on his left knee the day before.
NFL Network's Ian Rapoport reported it is unknown if Bradford will dress, but he said the veteran is "quite healthy".
Zimmer said this week that Bradford is working his way back in with the other quarterbacks but "has a ways to go still". In 15 games played, he posted career highs across the board with 3,547 yards with 22 touchdowns with just seven interceptions while holding a 98.3 quarterback rating.
For whatever it's worth, all the way back on September 11, Bradford threw for 346 yards and three touchdowns in a 29-19 home win over the Saints in Week 1. When asked to assess Bradford's progress, Zimmer said, "It's kind of hard to judge with five practices".
There seemed to have been a true mental advantage for Keenum, who in addition to practice and game experience, got used to seeing the same plays over and over, knowing what to expect.
That win started a streak of eight in a row with Keenum under center.
Keenum's completion percentage ranked second in the National Football League among qualifying passers behind Saints quarterback Drew Brees, whose 72.0 rate edged past Bradford's 2016 mark of 71.6 for a new National Football League record.
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