Josh Sitton has recently become a free agent after two seasons with the Bears, and he is one of the best offensive linemen on the open market for the Colts.

One of the top priorities for the Colts this offseason should be upgrading their offensive line to protect Andrew Luck better than they have over the first five seasons of his career.

Quality offensive linemen are hard to find, but one of the best guards in the league has become available after the Bears declined the option on Josh Sitton‘s contract making him a free agent.

Sitton has been an elite guard during the entirety of his ten-year career making the Pro Bowl in four of those ten years. After playing in all 16 games from 2012-15, Sitton has struggled a bit with injuries playing in just 26 of the Bears’ 32 games over the past two seasons.

However, Sitton’s ankle injuries aren’t thought to be a long-term problem, and he’s continued to play at a high level through those injuries. Sitton is also only 31 years old, so signing him to a long-term deal wouldn’t be a dangerous proposition.

The Colts don’t really have a starting-caliber guard on their roster.

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Jack Mewhort is set to become a free agent his offseason, and he has some injury issues that need to be sorted out. The rest of the depth chart at guard contains unproven players, and linemen who have played poorly during their time in Indianapolis.

Offensive linemen of Sitton’s quality aren’t available on the open market very often, and I’d be eager to sign him in free agency if I’m Chris Ballard.

Here are some other possible free agent targets for the Colts this offseason:

Le’Veon Bell

Doug Martin

Jerrell Freeman

Allen Robinson

Sammy Watkins

Jarvis Landry

Anthony Hitchens

NaVarro Bowman

Malcolm Butler

Trumaine Johnson

Dion Lewis

Paul Posluszny

Andrew Norwell

Marqise Lee

Jerick McKinnon

Nate Solder

Sheldon Richardson

Kyle Fuller

E.J. Gaines

T.J. Carrie

Nickell Robey-Coleman

Bryce Callahan

Brandon Fusco