"It was an honest mistake and something I need to learn from and make sure it doesn't happen again," Manziel said.
The team initially scheduled players to meet at 8:15 a.m. but changed the start time to 7:30 a.m. Manziel and a few other rookies were late for the meeting, according to ESPN.
"I think we had to come in at 7:30 and it was the only day that we had had to come in at that time throughout camp," Manziel said. "I was on time for what I thought was our normal 8:15 meeting time. It was a misinterpretation, a misreading of the schedule. I sat down with coach (Mike) Pettine and talked to him and we handled it and we've moved on."
Manziel also admitted that he is not ready to begin the regular season as the team's starter.
"I don't think I'm ready for Pittsburgh right now," Manziel said. "I've only played one game."
But that does not mean he does not have time to be prepared for the Sept. 7 opener against the Steelers.
"I don't want that taken out of context," Manziel added. "I can get ready. Right now it's the second week of preseason."
Pettine still plans to make his starting quarterback decision on Tuesday to get ready for the season opener at Pittsburgh.
Pettine said Manziel is still capable of winning the job over Hoyer.
"Sure he can," Pettine said. "All of our options are still on the table. I think a lot of people read into what happened, but every option for us is still on the table."
Manziel said he does not feel any extra weight on him being a highly-publicized rookie battling for a starting spot.
"I don't think there's any pressure on me," he said. "I'm still learning, I'm still growing. The expectations aren't through the roof."
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