Tom Brady is weighing in on Bill Belichick's departure from New England ... saying he's thankful he was able to play for the greatest NFL coach of all time.
TB12 shared his thoughts about the huge Patriots news in a lengthy Instagram post on Thursday ... saying Belichick was "a great leader for the organization, and for all of the players who played for him."
"We accomplished some amazing things over a long period of time, many of which will be hard to replicate."
Brady and Belichick were one of the greatest combos in NFL history -- they led the Pats to 19-straight winning seasons and 17 division titles during their time together.
They also appeared in nine Super Bowls ... taking home the Lombardi Trophy six times.
"He worked every day to help us achieve the ultimate goal, in the ultimate team sport," Brady continued. "And, although we were successful, some of the greatest lessons, I learned, were in the moments where we faced the most challenging adversities."