The Denver Post reports Miller wasn't in the Arapahoe County courtroom in suburban Denver when his lawyer entered the guilty pleas to a lane change violation and speeding.
Miller's rehab is expected to take six to nine months, meaning he could miss the start of the Denver Broncos' training camp next summer. Miller's right knee buckled when he was blocked cleanly by Texans tight end Ryan Griffin in Denver's 37-13 win at Houston on Dec. 22.
There was no update on his injury after the game.
Miller suffered the injury during the first quarter, but was able to walk off the field on his own.
Miller had his best game of the season after missing the start of the year because of an NFL suspension.
Miller's lawyer, Abraham Hutt, said neither he nor prosecutors thought Miller had to be present for his Arapahoe County Court hearing Monday morning. Magistrate Christina Apostoli wanted him there, however, so Miller was summoned from the team's nearby headquarters. Players were off Monday. When coach John Fox met with the media, he said Miller "was just going on his lawyer's advice," not to attend the hearing before being called to go over to the courthouse.
Coach John Fox said his All-Pro outside linebacker "had an outstanding practice. Obviously he's got fresh legs and ready to roll and excited about the opportunity this week." Miller had 30 sacks in his first two seasons for the Broncos, who went 6-0 in his absence despite the league's worst pass defense.
Miller was arrested when he tried to purchase a weapon last month and a routine background check revealed an outstanding warrant for failing to appear in court on traffic charges from last year. He also was pulled over near his suburban Denver home last week and cited for speeding and driving with a suspended license.
Robinson said Miller was with his father, who was then allowed to drive the vehicle. The Broncos declined comment on Miller's latest legal troubles when contacted by The Associated Press.
To make room, the Broncos waived wide receiver Tavarres King, whom they'd promoted from their practice squad earlier in the week to keep him from joining the Green Bay Packers. Miller returned to practice Wednesday after serving his ban for violating the league's drug-abuse policy. Miller has 30 sacks in his first two seasons and guaranteed a Super Bowl victory in the offseason.
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