The Browns waived Manziel on March 11. He threw for 1,500 yards with seven touchdowns and five interceptions and ran for 230 yards last year in 10 games, six of which he started.
Rosenhaus has handled NFL clients with colorful personalities before, such as wide receivers Terrell Owens and Chad Johnson. He currently represents the likes of New England Patriots tight end Rob Gronkowski, who's been known to have fun off the field. Manziel has even been out partying with Gronkowski before.
However, Manziel's lifestyle got to the point where he landed in rehab after his rookie season in Cleveland.
La Canfora added more to Manziel's unpromising outlook in free agency:
Teams have indicated no interest in Manziel until/unless he makes some major life changes and makes real strides towards sobriety...— Jason La Canfora (@JasonLaCanfora) March 19, 2016
Fox Sports personality Colin Cowherd made a comparison regarding Manziel's nightlife:
Although Manziel returned from rehab and became a better quarterback for the Browns in 2015, his penchant to self-destruct away from the team facilities brought an end to his underwhelming stint with the franchise.
On March 14, Bleacher Report's Jason Cole reported a suspension may be coming for Manziel as a result of his alleged domestic violence incident, which prompted Manziel's former agent, Erik Burkhardt, to drop him Feb. 5:
The Browns were burned by their considerable investment in Manziel, who came aboard as the 22nd overall pick in the 2014 draft. He has legitimate arm talent and improvisational skills and displayed a vastly improved ability to read defenses in 2015.
Considering Owens received a number of chances throughout his career, perhaps there's hope Rosenhaus can be a good diplomat for Manziel and give him a shot to play in 2016.
On the other hand, Owens was a special talent, while Manziel is not a proven commodity and has lingering durability concerns because of his size (6'0", 210 lbs). It's also unclear whether Manziel will be dedicated enough to justify a team taking a chance on him—even if Rosenhaus' persuasive tactics gain traction.