(Video courtesy Brad Williams)

Don’t count Dolphins RB Reggie Bush out against Arizona on Sunday -- at least not yet.

The star suffered an undisclosed knee injury last week in an overtime loss to the New York Jets, but an MRI this week revealed there was no structural damage. Still, the team would not comment on his status for Sunday at Arizona and coach Joe Philbin has a no-comment policy on injuries.

Bush did not participate in practice Wednesday, but the Palm Beach Post reported the former Southern Cal standout broke a sweat beside the field. Bush stretched, rode a stationary bike and did some light stretching, the newspaper reported.

"You've got to ask coach, but, I'm telling you right now, I'm playing Sunday," Bush told the South Florida Sun Sentinel.

Moving and shaking: The Dolphins signed DB Jonathon Amaya and LB Mike Rivera on Tuesday.

Rivera was one of the team’s final cuts last season, and Amaya was with Miami in 2010. The team was forced to add the two versatile players to bolster special teams as LBs Kevin Burnett (foot), Jason Trusnik (leg),Jonathan Freeny (thumb) and Koa Misi (foot) are hobbled with injuries. The secondary has been depleted since the preseason when Miami opted to trade veteran CB Vontae Davis to the Colts.

Amaya was a standout special teams player for the Saints last year with nine tackles on coverage teams and added a forced fumble. Rivera was on the active roster for the New England Patriots the first two weeks of the season before being cut.

The Dolphins released OL Ray Feinga and DB Troy Nolan to make room for the additions.

Going long: Dolphins QB Ryan Tannehill needs to work on his deep ball.

The rookie completed only two passes of more than 20 yards in an overtime loss to the Jets last week.

“It’s obvious, we weren’t real good there,” Dolphins offensive coordinator Mike Sherman said. “When the ball ends up out of bounds, it’s certainly not where we want to be. We want it to be somewhere between the sideline, halfway between the sideline and the numbers, in that general vicinity -- an area that we work on, the red line. We missed on a couple of those. There’s no question about that. It’s something he’ll work on this week.”

For more up-to-the-minute news and analysis on the Miama Dolphins from blogger Dave Carey, follow @CBSDolphins