It's believed the Bears could have interest in guards Andy Levitre and Brandon Moore.
Undrafted out of Tennessee, Foster has started 42 of 57 NFL games. Last season, he started all 16 games at right guard for the Steelers.
According to Pro Football Focus, Foster is the 10th rated free-agent guard on the market. Moore is No. 1 and Levitre is No. 2, according to PFF.
Overall, for the 2012 season, Foster was ranked 34th among guards by PFF. Moore was 4th, and Levitre was 9th.
So where did Bears linemen rank? Well, Lance Louis was 47th while Chris Spencer was 50th. So Foster, on paper, would represent an improvement, according to PFF.
Foster is 27 years old, and he's 6 foot 6, 325 pounds.
Foster should draw a fair share of interest, including from his initial team, the Steelers.