McMichael signed a four-year contract after being a fourth-round pick in 2002 and is scheduled to make $480,000 in base salary this season.
McMichael has been a starter since his rookie season and he's off to a tremendous start this season, with a touchdown in each of the Dolphins' three games.
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There was good and bad news on the injury front on Friday.
The good news was linebacker Junior Seau being upgraded from questionable to probable. Seau has been bothered by a calf injury, but didn't miss any part of the team portions of practice on Thursday or Friday.
The bad news was that wide receiver David Boston was added to the injury report on Friday because of a knee. Boston is listed as probable.