Detroit Lions running back Reggie Bush expects to be available to play Monday night against the Baltimore Ravens.

When asked by a reporter whether he fully expects to return this week, Bush responded with a one-word affirmative: "Yeah."

He then went on to explain exactly what happened to him Sunday during warm-ups when he re-aggravated his calf injury that eventually kept him out of the game.

"I didn't fall on the ground or anything like that," Bush said. "I was out there jogging. I wasn't even going hard. I was just jogging and it just grabbed on me."

Once that happened, Bush said, he was unable to play against the Philadelphia Eagles.

"I couldn't go," Bush said. "I couldn't even sit here and lie and say I would have been able to push through it. I couldn't push through it."

Otherwise, Bush can't really figure out how he re-aggravated his calf, which was an injury he said he suffered in practice. He said the cold weather could have played a factor, but that he practiced outside with Detroit on Friday, when it was cold, and felt good.