Miami Dolphins' Lamar Miller "unsure" of starting role

Miami Dolphins running back Lamar Miller has revealed that he does not know if he will be his side's starter this season.

Miller has been in battle with Daniel Thomas in training to become Joe Philbin's side number one back for the upcoming campaign.

"They haven't told us anything yet so I'm not sure yet," Miller told ProFootballTalk.com.

"That's the Coach's decision. I'm just trying to do everything to help this team win and when I get the opportunity to put the ball in my hands, I'm just trying to make plays for the offense and for this team."

Miami face the Cleveland Browns in their opener on Sunday.