"Put this in print: I just want to finish a game," McGahee said.
McGahee suited up for the season opener against the Cincinnati Bengals but remained on the sideline because of a knee injury. In Week 2 against the Cleveland Browns, he was limited in the second half after suffering a laceration on his right eyelid and getting poked in his left eye.
On Monday night in Pittsburgh, he received a helmet to his ribs in the second quarter and carried the ball just once in the second half.
McGahee said he considers himself "day-to-day" with the rib injury.
"I don't want to be out there for the first and second quarter and try to come back for the third and don't finish," McGahee said. "I want to finish a complete game, walking off the field with just a bruise on my arm."
McGahee said he hasn't been unlucky.
"I think something good is going to happen," he said. "I'm not one of those people who's going to get down."
McGahee, however, was agitated when a local radio reporter told him of recent comments made by Suzy Kolber. The ESPN sideline reporter speculated on the air Monday that the reason McGahee has been hurt so much is that he didn't take part in many offseason workouts and is out of shape.
"She's never played a day in the NFL," McGahee said. "Why would I listen to her?"
Three starters out
The Ravens will be without three starters on defense: cornerback Samari Rolle (neck and shoulder), safety Dawan Landry (neck) and nose tackle Kelly Gregg.
All three were listed as out on the Ravens' injury report.
This will be the second straight game missed by Rolle and Landry. Gregg has missed the entire preseason and the first three games of the season because of a cartilage problem in his knee.
"We're sending his MRI pictures to a couple other doctors," coach John Harbaugh said. "It's a very unusual injury, from what I'm told. It's responding somewhat. We just want to get another feel for what it is. We should know something this week."
Linebacker Bart Scott summed up the difference between the Titans' top two running backs - fleet-footed rookie Chris Johnson and 235-pound power back LenDale White. "Let's see: a fat guy and the fastest guy in the 40," Scott said. "Not fat. I'm sorry. Plump." ... Harbaugh said he "can definitely envision" quarterback Troy Smith playing this season, but he wouldn't define Smith's role. "He's going to be on the field for us this year, in some form or fashion for sure," Harbaugh said. ... The Ravens added two rookies, guard Nathan Bennett and wide receiver Edward Williams, to the practice squad. Williams was signed in April as an undrafted free agent by the Titans, Sunday's opponent. The Ravens placed offensive tackle Joe Reitz on injured reserve and waived quarterback Casey Bramlet.
Sun reporter Edward Lee contributed to this article.