Bruins coach Bruce Cassidy had no update on the extent of rookie defenseman Charlie McAvoy’s foot injury but ruled him out for tomorrow night’s clash with the Detroit Red Wings at the TD Garden. “I have nothing new to report, he’s getting evaluated this afternoon,” said Cassidy following team practice at the Garden. “He will not play tomorrow and we will go from there.” McAvoy was injured 37 seconds into Saturday night’s 2-1 overtime victory over the Montreal Canadiens. McAvoy appeared to trip awkwardly over the stick of Canadiens right wing Brendan Gallagher in the Bruins zone. McAvoy exited the ice in obvious pain and did not return.