Illinois' Rashard Mendenhall (5) is stopped by Eastern Illinois' John Coci late in the fourth quarter of a football in Champaign, Ill., Sept. 2, 2006. Illinois won 42-17. (AP Photo/Darrell Hoemann)

Illinois' Rashard Mendenhall (5) is slowed by Ohio's Lee Renfro (32) and Landon Cohen (55) during a football game in Champaign, Ill., Saturday, Oct 14, 2006. Ohio won 20-17. (AP Photo/Seth Perlman)

Illinois runningback Rashard Mendenhall (5) attempts to escape USC defenders during the Rose Bowl in Pasadena, Calif., on Jan. 1, 2008. (AP Photo/Brad Vest)

Illinois junior running back Rashard Mendenhall speaks during a news conference at his former high school in Skokie, Ill., Thursday, Jan. 10, 2008. Mendenhall, the Big Ten offensive player of the year, announced that he plans to forgo his senior year of eligibility and enter the 2008 NFL draft. (AP Photo/Brian Kersey)

Running back Rashard Mendenhall of Illinois takes questions during an interview at the NFL Combine in Indianapolis, Friday, Feb. 22, 2008. (AP Photo/Michael Conroy)

Running back Rashard Mendenhall, of Illinois, runs a drill at the NFL Combine in Indianapolis, Sunday, Feb. 24, 2008. (AP Photo/Michael Conroy)

Pittsburgh Steelers first round draft pick, running back Rashard Mendenhall, out of Illinois, puts his helmet on before drills on the first day of mini-camp at the team's football headquarters in Pittsburgh, Friday, May 2, 2008. (AP Photo/Keith Srakocic)

Pittsburgh Steelers first round draft pick, and rookie running back Rashard Mendenhall from Illinois, runs into a blocking dummy during the first day of drills in training camp at the football team's facility in Latrobe, Pa. Monday, July 28, 2008. (AP Photo/Keith Srakocic)

Pittsburgh Steelers first round draft choice Rashard Mendenhall, left, runs away from Philadelphia Eagles linebacker Omar Gaither in the first quarter of an NFL preseason football game in Pittsburgh, Friday, Aug. 8, 2008. (AP Photo/Keith Srakocic)

Pittsburgh Steelers running back Rashard Mendenhall (34) appears during preseason NFL football action against the Carolina Panthers in Pittsburgh. (AP Photo/Gene J. Puskar)

Pittsburgh Steelers running back Rashard Mendenhall hits the giant blocking dummy during a practice session at their NFL football training camp in Latrobe, Pa., Sunday, Aug. 2, 2009. (AP Photo/Keith Srakocic)

Pittsburgh Steelers running back Rashard Mendenhall (34) is brought down by Arizona Cardinals' Antrel Rolle after a one-yard gain during the first quarter of a NFL pre-season football game in Pittsburgh, Thursday, Aug. 13, 2009. (AP Photo/Gene J. Puskar)

Pittsburgh Steelers running back Rashard Mendenhall (34) walks off the field after his 50-yard game-winning touchdown-run against the Atlanta Falcons in overtime of an NFL football game in Pittsburgh, Sunday, Sept. 12, 2010. The Steelers won 15-9. (AP Photo/Gene Puskar)

Pittsburgh Steelers' Rashard Mendenhall (34) and Arsenal Middle School students on the field during an NFL Network Keep Gym in School minicamp in Pittsburgh, Tuesday, Sept. 28, 2010. NFL Network, Comcast and the Pittsburgh Steelers donated $25,000 to the school's physical education department as part of the program's initiative to ensure quality physical education in America's middle schools.(John Heller/AP for NFL Network�s Keep Gym in School)

Pittsburgh Steelers' Rashard Mendenhall (34) runs as Green Bay Packers' Clay Matthews (92) tries to stop him during the second half of the NFL Super Bowl XLV football game Sunday, Feb. 6, 2011, in Arlington, Texas. (AP Photo/Patrick Semansky)

Arizona Cardinals running back Rashard Mendenhall (28) during training camp on Saturday, July. 27, 2013 in Glendale, Ariz. (AP Photo/Rick Scuteri)

Arizona Cardinals' Rashard Mendenhall runs with the ball against the Houston Texans during the second half of an NFL football game on Sunday, Nov. 10, 2013, in Glendale, Ariz. The Cardinals defeated the Texans 27-24. (AP Photo/Ross D. Franklin)

Arizona Cardinals running back Rashard Mendenhall (28) is tackled by Carolina Panthers outside linebacker Thomas Davis (58)during the first half of a NFL football game, Sunday, Oct. 6, 2013, in Glendale, Ariz. (AP Photo/Matt York)

Arizona Cardinals running back Rashard Mendenhall (28) during the second half of a preseason NFL football game against the Dallas Cowboys, Saturday, Aug. 17, 2013, in Glendale, Ariz. The Cardinals won 12-7. (AP Photo/Rick Scuteri)

Arizona Cardinals running back Rashard Mendenhall (28) during the first half of an NFL football game against the St. Louis Rams, Sunday, Dec. 8, 2013, in Glendale, Ariz. (AP Photo/Rick Scuteri)

Arizona Cardinals running back Rashard Mendenhall (28) runs agains the San Diego Chargers during the first half of a preseason NFL football game, Saturday, Aug. 24, 2013, in Glendale, Ariz. (AP Photo/Rick Scuteri)

Arizona Cardinals' Rashard Mendenhall waits for the autograph session to start during opening night Fan Fest at minicamp, prior to NFL football practice on Tuesday, June 11, 2013, in Glendale, Ariz. (AP Photo/Ross D. Franklin)