With NFL free agency arriving next week, there is certain to be a flurry of movement around the league with the Bears being one of the many teams losing players that were major contributors in the 2012 season.

Here is a breakdown of a few Bears key free agents and their production last season:

-- Veteran Israel Idonije started 11 games with nine at defensive end and two at defensive tackle. He also boasted 40 tackles with four for a loss and 11 quarterback pressures.

-- Kelvin Hayden eventually took over the nickel spot, beating out Chicago native D.J. Moore who added 40 tackles and one interception. He gave the Bears a proven veteran in the secondary and was a positive addition to the roster.

-- Former Northwestern standout, Nick Roach -- the most unheralded of the starters -- has been nothing but consistent during his stint with the Bears. He was sixth on the team in tackles, contributing 84 and 1.5 sacks.

It’s been noted Moore will not be returning after being told by Bears staff he did not fit into plans for the upcoming season, making the corner position rather thin if Hayden will not return.

The good news is all of the key contributors on offense are under contract at quarterback, wide receiver and running back.