"Willie Parker didn't practice Wednesday because of turf toe, putting the veteran running backs' availability for Sunday's game at Detroit in question. Parker didn't play in the Steelers' 38-28 win over San Diego last Sunday. If Parker is unable to play against the Lions, it will provide another opportunity for Rashard Mendenhall. Making his second career start last Sunday, Mendenhall rushed for 165 yards and two touchdowns.

His performance earned Mendenhall AFC Offensive Player of the Week honors.

• In addition to Parker, left guard Chris Kemoeatu (ankle) and inside linebacker Andre Frazier (shoulder) didn't practice yesterday for the Steelers because of injuries.

• Among the Lions that didn't practice were quarterback Matt Stafford (knee), wide receiver Calvin Johnson (thigh) and offensive tackle Gosder Cherilus (shoulder).

• Lions coach Jim Schwartz said yesterday he expects Johnson to play against the Steelers. He was non-committal when asked about Stafford, the No. 1 overall pick of the 2009 draft. Stafford hurt his right knee last Sunday while getting sacked in a 48-24 loss to Chicago. Steelers linebacker James Farrior said he expects Stafford to start Sunday. Daunte Culpepper will get the nod in the 1 p.m. game if Stafford is unable to play."