Tony Scheffler is retiring from the NFL, Larry Lage of the Associated Press reports.
Scheffler said on Wednesday he made the choice because he had three concussions over the past four years.
He had 258 receptions for 3,207 yards and 22 touchdowns in his eight-year career. The Detroit Lions released Scheffler in October. He later had workouts with Chicago and Kansas City and says there was "moderate" interest in him as a free agent this offseason.
Denver drafted him in the second round in 2006 out of Western Michigan and traded him four years later to Detroit.
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