The Packers released defensive lineman Letroy Guion, ending a three-plus year tenure in Green Bay marked by off-field problems.

Guion was arrested on suspicion of drunken driving in Hawaii in June. In an unrelated incident, the NFL suspended him without pay for the first four games of the 2017 season for violating a policy on performance-enhancing drugs.

It was the second disciplinary action against Guion in three seasons. The NFL suspended him for the first three games of the 2015 season for violating its substance abuse policy.

The Packers announced Guion's release while the team was at practice. He had signed with Green Bay in 2014 after spending six seasons with the Vikings. Guion started 15 regular-season games and all three postseason games last year for Green Bay.

Kenny Clark, last year's first-round draft pick, already was expected to play an expanded role on the defensive line alongside Mike Daniels.

"Man, he's a great teammate. I feel like people really don't know him and don't understand that," Clark said. "Came in with a lot of energy, put smiles on all our faces, I can genuinely say that."

Scare for 49ers

San Francisco rookie linebacker Donavin Newsom suffered a concussion during Tuesday's practice, but the 49ers said he didn't sustain any cervical spinal fractures.

He was taken from the practice field in an ambulance after taking a hit to the head and neck.

Newsom lay motionless on the field for nearly five minutes after colliding with safety Chanceller James while trying to break up a pass during a two-minute drill.

Etc.

• Hall of Fame quarterback-turned broadcaster Len Dawson, who led Kansas City to three AFL titles and its only Super Bowl, will retire from the Chiefs radio booth after the season.

• Cincinnati coach Marvin Lewis missed practice for what the Bengals called a minor health issue. He used a cart to shuttle to the practice field earlier this week.

• Jacksonville placed left tackle Branden Albert on the reserve/retired list, essentially ending his brief and baffling tenure with the Jaguars.

• Cleveland receiver Corey Coleman was cleared of wrongdoing in an assault case.