Long stretched with the rest of the team at the start of practice, but when drills began he went to the side and rode an exercise bicycle. Coach Tony Sparano has declined to comment on Long's status for Sunday's opener.
When asked by reporters if he'd be ready for Week 1, Long said, according to the South Florida Sun-Sentinel: "I'll be all right."
Linebacker Channing Crowder also rode a bike. He has been sidelined since Aug. 17 because of an unspecified injury.
Long, who has started every game in his first two NFL seasons, hurt his knee in the Dolphins' final exhibition game Thursday at Dallas. Starters typically see little action in the last preseason game.
"It's just an unfortunate circumstance," Sparano said. "I'm not going to Monday-morning-quarterback any of those decisions."
Listed behind Long on the depth chart is Lydon Murtha, a second-year pro from Nebraska who played in one game off the bench last year.
"There's obviously another whole step that needs to take place for Lydon, because he hasn't played meaningful plays in a game," Sparano said.
Information from The Associated Press was used in this report.
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