Brown's agent, Drew Rosenhaus told Al Michaels the story before Sunday Night Football as the Pittsburgh Steelers prepared to face off with the New England Patriots in Foxborough.
When Brady initially heard about the deal, he reportedly said, "I'm a thousand percent in," before announcing, "I'm a million percent in!"
Brown won't be suiting up for SNF, as he's not eligible to play yet.
His first official game as a Patriot will be next week in Miami against the Dolphins.
Brown is in New England, however, and documented his journey to the East Coast.
Since landing, Brown was greeted by fans, and then appears to be in a hotel room getting a massage while watching football.
Fans at Gillette Stadium are very excited for the recent acquisition, and signs touting AB's arrival in Massachusetts could be seen everywhere.
The NFL star has not been quiet about his departure from Oakland, and has been posting cartoons of the situation, such as himself leaning back in a Patriots jersey while it rains money all around.
His one-year deal is reportedly for $15 million, with a $9 million signing bonus.
Before Sunday's game, AB went on Instagram and told fans, "excited to get to work lets go tonight."
Many fans are pulling for Brown to have a big season after all the drama, especially OJ Simpson, who made it clear he's going to stay ride or die.