"Mike Tomlin has not had to worry about hiring an offensive or defensive coordinator since he became head coach in 2007. Now, that might change.

Tomlin could be facing his first significant hire since replacing Bill Cowher because offensive coordinator Bruce Arians might not return in 2012, the Pittsburgh Post-Gazette has learned. Arians, 57, is in the final year of his contract with the Steelers, and it is unclear if he is retiring -- something he considered last year -- or not having his contract renewed."