This is the third time in the last four years Boston has ended the season on injured reserve, and this latest setback is sure to raise questions about his future in the NFL.
To replace Boston on the active roster, the Dolphins re-signed wide receiver Cliff Russell, a fourth-year player out of Utah.
Russell had signed with the Dolphins on Oct. 12 and been released six days later after being inactive for the game at Tampa Bay.
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But Saban said both players are fine.
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Having faced Tom Brady in college, Saban said he hasn't been surprised in the least by the success Brady has had in the NFL after joining New England as a sixth-round draft pick. Saban was the Michigan State head coach when he faced Brady, who played at Michigan.
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Saban was asked Wednesday about New England's wide receiver corps, which doesn't feature a Pro Bowl player on it but is very good and very deep. "Their receivers are outstanding," Saban said. "If they don't have big names, they should. Two of them have been stalwarts for a significant period of time, so it's not any big news."