It's been a difficult season for Mendenhall, who fell into coach Mike Tomlin's doghouse after fumbling in a loss to the Browns last month.
At the same time, his two backups -- Jonathan Dwyer and Isaac Redman -- have stepped in and essentially taken his job over the last month. While there's been no word as to why Mendenhall was suspended, the loss of snaps and carries is almost certainly at the root of his issues with Tomlin and the rest of the Pittsburgh organization.
The fifth-year RB from Illinois has had the worst season of his career in 2012, rushing for only 3.3 yards per carry, far less than either Dwyer (4.3) or Redman (3.6).
As a result, his days in Pittsburgh were likely numbered, even before his run-in with the coaching staff.
He was drafted one spot after Felix Jones in the 2008 first round, and it's likely that both will be looking for a new team in 2013.