"I was a little encouraged, but we'll just see how it goes," Reich said, per The Athletic's Stephen Holder.
The diagnosis does not come as a surprise, as the Colts suspected following Sunday's game that Brissett's knee injury was minor.
The 5-3 Colts need not rush Brissett back if he's not feeling 100 percent, even though they trail Houston by a half-game in the AFC South. Coming off its first win in eight attempts, Miami should not pose a serious threat to Indy in Lucas Oil Stadium regardless of who is under center.
Brissett's injury is a setback for the 26-year-old quarterback who was progressing in his first year as an anointed starter. Brissett has a 64.8 completion percentage, a 14-3 TD-to-INT ratio and 1,649 passing yards through eight starts.
Indianapolis will likely provide an update on Wednesday as to whether Brissett will be making his ninth this Sunday.