Wes Welker says he's not worried about his concussion history as he returns to the NFL with the St. Louis Rams.

"Not at all," he said when asked the question. "I've been cleared by the doctors and everything else. Obviously I'm not going to try and look for contact and everything like that, but I'm not thinking about it either.

"I'm out there playing hard and playing the way I need to play to be successful. You start second-guessing yourself out there and that's when you get in trouble."

Welker said he played last year without a head injury.