NFL Network Insider Ian Rapoport reported Friday that the former Patriots backup, acquired via trade just ahead of the team's season-opening loss to the Rams, has forced Week One starter Scott Tolzien to the bench.
Colts coach Chuck Pagano told reporters, however, no decision has been made on who will start Sunday.
"We're not ready to announce it," Pagano said Friday.
Tolzien went 9 of 18 for 128 yards and two interceptions last Sunday while Brissett in relief went 2 of 3 for 51 yards.
Tolzien was also sacked four times.
This is a move that makes sense for the Colts long-term but may carry some short-term problems. Since the retirement of Matt Hasselbeck, Indianapolis has struggled to find adequate, replacement-level backups behind Andrew Luck. And given that Luck is coming off a serious shoulder surgery (he has yet to practice), Brissett represents the opportunity to develop a player that is affordable and under contract through 2019.
"You have to make some adjustments. He's been here a week," Chudzinski told The Indianapolis Star. 'Getting to know him is as important as him getting to know the playbook. That's a process that happens over time."
Sometimes, there are no better learning opportunities than the ones occurring on the fly. In Brissett's only extended action of the preseason, he went 28 of 39 for 340 yards and four touchdowns in a preseason finale against the Giants. Over two appearances last year during Tom Brady's suspension, Brissett was 34 of 55 for 400 yards, no touchdowns and no interceptions. The Patriots went 1-1 in those two starts.