ST. LOUIS - St. Louis Blues defenceman Alex Pietrangelo has been placed on injured reserve with a right knee injury that the team says will be re-evaluated in three weeks.

The 26-year-old Pietrangelo was injured in a knee-on-knee collision with Minnesota's Charlie Coyle in a 4-1 victory over the Wild on Saturday. He's fourth in the NHL in playing time, averaging over 26 minutes.

Pietrangelo has played in all 55 games and has 23 points on three goals and 20 assists. He was the fourth overall pick in 2008 and has a career plus-37 rating.