Manziel's account to the Browns was earlier reported by Fox Sports.
One week after being named the team's starter, Manziel was demoted to third string for Monday night's game against the Baltimore Ravens after social media posts surfaced showing Manziel allegedly partying last weekend in Texas during the team's bye week.
According to a league source, Manziel told the Browns that an online video showing him singing in a club and holding what appeared to be champagne bottle was old. He also encouraged his friends to lie about when the video was recorded, according to the Fox Sports report.
Browns coach Mike Pettine was asked Wednesday if Manziel admitted the video was from last weekend.
"I won't get into the details of what we talked about," Pettine said.
"The improvements from last year to this year have been tremendous," Pettine said of Manziel in a statement that day, "but he still has to consistently demonstrate that he has gained a good understanding of what it takes to be successful at the quarterback position on this level. It goes well beyond the field."
Manziel had been named the Browns' starter after he threw for 372 yards in a 30-9 loss to the Steelers on Nov. 15. When he was named the starter, Pettine talked to Manziel about appropriately representing the organization. Manziel told reporters before the bye week that he was "not going to do anything that's going to be a distraction to this team or be an embarrassment to the organization."
Last month, Manziel made headlines after witnesses reported him driving dangerously on an interstate highway, and his girlfriend said he had gotten physical with her in the car. Manziel was questioned by police, who smelled alcohol on Manziel's breath but did not give him a field sobriety test because he showed no signs of inebriation. Just last week, the NFL announced Manziel would not face discipline for the incident.
Manziel spent 10 weeks in a treatment facility during the offseason for undisclosed reasons.