Although both running backs are coming off serious injuries suffered in 2007, all indications out of Miami are that the Dolphins are preparing to enter the 2008 season with Ronnie Brown as their starter and Ricky Williams as their top backup.

The agent for Brown, who tore the ACL in his right knee in October, says there’s no reason the Dolphins can’t count on him to return to the starting lineup.

“He’s started running a while ago, is lifting weights, is in great spirits and on track,” Brown’s agent, Todd E. France, tells Harvey Fialkov of the South Florida Sun-Sentinel. “We don’t see any obstacles in our way. … He’s got the drive to be ready.”

Similarly, Leigh Steinberg, Williams’ agent, says the torn pectoral muscle he suffered in his one and only game last year will be healed by the start of the season.

“Ricky has just been cleared for all activities, other than heavy lifting,” Steinberg said. “His exchanges with [Dolphins vice president of football operations] Bill Parcells have all been positive. Knowing Bill’s track record, Ricky is encouraged and excited about the coming season.”

The Dolphins haven’t shown much interest in acquiring a running back, either via free agency or the draft, and they allowed Jesse Chatman, who led the team with 128 carries last season, to leave for the Jets. Presumably, that means they think the agents for Brown and Williams are telling the truth when they say the players will be ready to go.