Adrian Peterson and the Minnesota Vikings have reached a standstill in their professional relationship.

Peterson previously expressed uneasiness about continuing to play for the Vikings, coming off a season lost because of a child abuse case. But his camp has since advanced that stance to the point of wanting out.

Peterson’s agent, Ben Dogra, said as much Monday to reporters at NFL meetings in Arizona and reiterated his comments in a phone interview Tuesday.

“You make tough choices in life. We clearly understand he’s under contract with the Vikings. After several discussions and much thought, I believe that it’s not in his best interest to resume his career in Minnesota,” Dogra said. “It might be best for all parties involved for him to resume his career elsewhere.”

General Manager Rick Spielman has told Dogra he doesn’t plan to release Peterson, who turned 30 on Saturday.

BEARS: The team agreed to a one-year contract with former San Francisco defensive end Ray McDonald.

The 49ers cut McDonald in December after a woman accused him of sexually assaulting her following a night of drinking in which she injured her head in a fall by his swimming pool.

TITANS: The man selected by the team owners to oversee the Titans and help search for a new president and chief executive officer said that they have made it clear the franchise is not for sale.

Steve Underwood said rumors of a team being sold are heard whenever a longtime owner dies. Bud Adams died in October 2013, but Tommy Smith announcing his retirement Friday raised questions about whether Adams’ family was preparing to sell the team.

Owners shot down nearly every video replay proposal brought to their meetings while approving six safety rule changes.

Of the 13 replay alterations proposed, including extending the number of coaches’ challenges and letting them challenge all officiating calls, the only one passed will allow game officials to use replay for clock issues at the end of a half, game or overtime if more than one second remains.

The Super Bowl turns 50 this year and the NFL is planning a golden yearlong celebration.

The league unveiled plans that include sending a gold-colored football to the high school of every player or head coach who played in the game. The football will have the player’s name and the name of the high school. In some cases the player will go to the school to present the ball.

BROWNS: Coach Mike Pettine expects quarterback Johnny Manziel to take part in the team’s practices next month after leaving rehab.

Pettine said the team has received “good” feedback about Manziel, who entered a treatment facility Jan. 28 for an undisclosed problem. A first-round draft pick in 2014, he backed up Brian Hoyer before playing poorly in two starts. Following the season, Manziel acknowledged he should have taken his job more seriously.

JETS: The team signed defensive end Stephen Bowen and offensive tackle Corey Hilliard, adding veteran depth onto its lines.

The Jets also made the signing of defensive end Kevin Vickerson official.