The 31-year-old Long is the former No. 1 overall pick of the Miami Dolphins in the 2008 draft out of Michigan. He is a four-time Pro Bowler (2008-11) but had two surgeries on his anterior cruciate ligament since 2013, which will be the big factor on what level of performance they get out of him.
He has appeared in 100 games, starting 96.
The Vikings have some familiarity with Long. He was teammates with Vikings quarterback Sam Bradford in St. Louis in 2013 and played for the Miami Dolphins when Vikings offensive line coach Tony Sparano was the head coach there from 2008-11. Those years match up with Long’s four Pro Bowl seasons.
Last year, Long played sparingly for the Atlanta Falcons.
Long takes the roster spot previously held by right tackle Andre Smith, who was scheduled to have triceps surgery on Tuesday and was placed on injured reserve.