Cleveland Browns quarterback Johnny Manziel has entered rehab for treatment.

Brad Beckworth, friend and advisor to Manziel and his family, confirmed that the rookie entered treatment on Wednesday.

“Johnny knows there are areas in which he needs to improve in order to be a better family member, friend and teammate and he thought the offseason was the right time to take this step. On behalf of Johnny and his family, we’re asking for privacy until he rejoins the team in Cleveland,” Beckworth said in a statement Monday.

Browns general manager Ray Farmer also released a statement.

“We respect Johnny’s initiative in this decision and will fully support him throughout this process. Our players’ health and well-being will always be of the utmost importance to the Cleveland Browns. We continually strive to create a supportive environment and provide the appropriate resources, with our foremost focus being on the individual and not just the football player. Johnny’s privacy will be respected by us during this very important period and we hope that others will do the same,” Farmer said.

According to ESPN.com, Manziel is expected to be in rehab at least a few weeks, but the amount of time depends on what doctors recommend. Manziel is voluntarily entering treatment as a direct result of his lifestyle away from the field, and he informed people in his circle last week that he wants to “figure out his value system,” a source said.

—The Atlanta Falcons announced Monday that former Seattle Seahawks defensive coordinator Dan Quinn will be their new coach.

Quinn had been reported to be the Falcons’ head-coach-in-waiting for a few weeks. He reportedly received a five-year contract.

The Falcons could not finalize the deal with Quinn until after the Seahawks finished competing in Sunday’s Super Bowl in Glendale, Ariz. The Seahawks lost 28-24 to the New England Patriots.

Quinn, who led Seattle’s No. 1 defense the past two seasons, becomes the 16th coach in Falcons history. He replaces Mike Smith, who was fired after the Falcons went 6-10 in 2014.

“This is an exciting day for the Atlanta Falcons franchise and our fans,” Falcons owner Arthur Blank said. “Dan is a talented football coach who has a deep and diverse history in the game, which will serve us well.”

—San Diego Chargers center Nick Hardwick will retire from the NFL on Tuesday, the team announced Monday.

Hardwick, an 11-year veteran, had been quarterback Philip Rivers’ main center since Rivers became the Chargers’ starter.

A third-round draft pick out of Purdue in 2004, the same year the Chargers acquired Rivers, Hardwick started 136 games — 108 with Rivers as quarterback.

Hardwick’s final season was ended by a neck injury in Week 1.

Hardwick made the Pro Bowl in 2006 as he helped running back LaDainian Tomlinson rush for 1,815 yards and score an NFL-record 31 touchdowns.

—The Baltimore Ravens followed through on their plan to release defensive tackle Terrence Cody, shortly before he was indicted for animal cruelty.

A Baltimore County grand jury indicted Cody, who was released on $10,000 bail.

Among the 15 charges Cody faces, according to the state prosecutor, seven are related to abuse of a dog, six are related to abuse of an alligator and two are related to marijuana possession.

The Ravens had said on Jan. 23 that they would terminate his contract after the Super Bowl. They have not said whether the decision had anything to do the animal cruelty investigation.

—Hall of Fame defensive lineman Warren Sapp was arrested Monday morning in Phoenix for soliciting a prostitute and assault.

Two female victims suffered minor injuries in the alleged assault, Phoenix Police Chief Joseph Yahner said, according to FOXSports.com.

Sapp, 42, was in Arizona to cover the Super Bowl for NFL Network, which suspended him Monday after news of the arrest and later fired him.

Sapp had worked for NFL Network since 2008.

—The Indianapolis Colts signed Canadian Football League wide receiver Duron Carter on Monday.

Carter, son of Hall of Fame receiver Cris Carter, reportedly agreed to the deal last week.

Carter caught 124 passes for 1,939 yards and 12 touchdowns for the Montreal Alouettes over the past two years. He 75 catches for 1,030 yards and seven touchdowns last season.