The 22-year-old caught his second touchdown pass of the season in his side's win over the Miami Dolphins, as he hauled in four receptions for 60 yards in the game.
Belichick told reporters: "I think you're really seeing a good day-by-day consistency -- on and off the field, on the field, in the weight room, his conditioning, in the classroom, walkthroughs, all that.
"He's focused and he just keeps improving. I think it's a very steady incline."
The Patriots are 6-2 in their season going into their week nine clash with the Pittsburgh Steelers.