Cleveland coach Mike Pettine said the league plans to investigate the high-profile backup quarterback's domestic dispute last week, an altercation which raised new concerns about Manziel and his future with the club.
Manziel was questioned by police in Avon, Ohio, after his girlfriend claimed he was physical with her when the two had a heated disagreement while driving on an Interstate highway. Colleen Crowley can be heard telling police on a dash-cam video released Monday that Manziel "hit me a couple times" and "I'm in fear for my life."
Manziel was not arrested and Crowley did not press charges. The couple was allowed to leave the scene together and Friday both went on social media to downplay their disagreement.
League spokesman Brian McCarthy said Manziel's situation will be reviewed.
"It is standard procedure to look into any incident that is a potential violation of our personal conduct policy," McCarthy said in an email.
Pettine did not have a timetable on the league's inquiry.
According to the police report, Crowley was intoxicated and made inconsistent statements about Manziel's actions. The couple were interviewed by police along the roadside after witnesses said Manziel had driven at high speed on the shoulder of Interstate 90 and cut across several lanes to an exit.
The couple said they had been drinking alcohol earlier in the day. According to the police report, an officer determined Manziel was not intoxicated and "had consumed only two alcoholic drinks several hours prior."