Bozak, a forward, who spent his first nine NHL seasons with the Maple Leafs, signed a three-year, $15 million contract (average annual value $5 million) with the Blues as an unrestricted free agent July 1.
In 594 games with the Maple Leafs, Bozak had 365 points (136 goals, 229 assists). He has two points (one goal, one assist) with the Blues, who are 0-2-1 in their past three games.
The Blues have won four straight against the Maple Leafs.
The Maple Leafs had a five-game winning streak end on Thursday with a 3-0 loss to the Pittsburgh Penguins. They have outscored opponents 27-19 over the past six games. Forward Auston Matthews had seven-game multipoint streak end Thursday. He leads the NHL in goals (10) and points (16).