The Minnesota Vikings' receiver carousel never seems to stop spinning.
Sidney Rice, Percy Harvin and Greg Lewis all missed Thursday's practice, leaving only three of the six receivers on the 53-man roster -- Bernard Berrian, Greg Camarillo and Hank Baskett -- on the field as preparations continued for Sunday's game against Buffalo.
Rice, who continues to battle through soreness and minor pain related to his August hip surgery, was held out as a precaution. Harvin fell in with another migraine headache on Wednesday, while Lewis looks like a long shot to play against the Bills because of the concussion he sustained last weekend at Washington.
Rice spent most of his Pro Bowl 2009 season as the "Z" receiver, but he's been pressed into action on the other side of late because of Berrian's groin problems. In two games, Favre has thrown Rice's way 14 times but completed only four for 76 yards, with several throws way off the mark.
"It's totally different," said Rice, who has played 70 of his 106 snaps (66%) at the new spot. "You've got to learn a different position, because you've got certain play calls for the 'Z,' certain play calls for the 'X.' But it's just a matter of knowing your playbook. Study a lot. I knew most of the 'X,' but when I moved over to the 'X,' I had to study just a little bit more to make sure I had everything down."