Barth, who was released earlier Wednesday by the Broncos, will compete with Pat Murray for the starting job. Barth played for the Bucs from 2009-13, although he missed the 2013 season entirely after tearing his Achilles in a charity basketball game.
Barth supplanted McManus as the kicker on field goals and extra points after 10 games in 2014. Barth hit 15 of 16 field goals down the stretch, but McManus was added back to the roster after Barth struggled on kickoffs in his first game.
Although, special teams coordinator Joe DeCamillis studied what plagued McManus as a rookie and feels his struggles were easily explained.
"He's just like any other player -- young," DeCamillis said Aug. 18, per the team's official website. "Unfortunately, you look at kickers and they should make everything, right, whoever they are. If they haven't done it a bunch yet, they're going to have those hiccups. You have to be able to come back from it and hopefully he did."
McManus connected on 9 of 13 field goals last season. He was 41 for 41 on extra points.
Hartley, a Super Bowl winner with the Saints, will replace Shaun Suisham, who tore his ACL during Sunday's Hall of Fame Game.
Suisham will have surgery on his left knee this week, forcing the Steelers to search for another kicker. He will likely be placed on injured reserve, which will put an end to his season.
Suisham suffered the injury during the opening kickoff of the second half Sunday. He converted 59 of 64 field goals over the past two seasons for Pittsburgh.
Tomlin did not elaborate on when or how Suisham suffered the injury. He kicked off to start the second half and left the field shortly thereafter. He left the locker room with his knee heavily wrapped.
All three players can return from the list at any time, once they are medically cleared to play. The team didn't release any details on their injuries.
To make room for Hill on the roster, the Jets parted ways with kicker Andrew Furney.
"I'm extremely excited to be a part of the Minnesota Vikings moving forward," Walsh said. "I'd like to thank Rick Spielman, the Wilf family, Coach Zimmer, Coach Priefer and Rob Brzezinski for giving me this opportunity. I'm proud to be able to stay with the team that drafted me coming out of college and I look forward to what is in store for the future of this organization."