Fletcher was a game-time decision, going through an extensive test in front of Patriots team doctor Thomas Gill, head strength coach Harold Nash, football research director Ernie Adams and others.
His absence opens the door for rookie linebacker Steve Beauharnais, the seventh-round pick out of Rutgers, to be active. Also, rookie defensive end Michael Buchanan, who was inactive last week, is active today and could help fill Fletcher's void on special teams.
The full list of Patriots inactive players:
LB Dane Fletcher
LT Nate Solder
WR Josh Boyce
The full list of Ravens inactives:
CB Asa Jackson
TE Dallas Clark