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The Dolphins may have worked out Clinton Portis on Monday, but it doesn’t look like they’ll sign him.

Instead, they are going for another aging running back that we figured was probably done in the NFL. Miami announced the signing of former Chiefs and Redskins running back Larry Johnson.

Johnson’s star was bright enough that his signing in Washington last year actually made big news. And then he was only healthy and effective enough to carry the ball five times for Washington.

Johnson turns 32 in November and three teams have given up on him in the last two seasons. It’s hard to imagine him making a big impact in Miami, and it wouldn’t surprise us if he didn’t make the team.

This may be a sign the team isn’t overly happy with rookie Daniel Thomas, who has been tentative around the goal line. The team also cut Kory Sheets Tuesday.

Jeff Darlington of the Miami Herald joined PFT Live Monday and made it clear that Reggie Bush, not Thomas, has taken the primary running back role over in Miami.