VIDEO: Blues' Reaves ejected for hit from behind on Sharks' Tennyson

St. Louis Blues defenseman Ryan Reaves received a five-minute major for boarding and a game misconduct after nailing San Jose Sharks defenseman Matt Tennyson face-first into the boards during the first period Monday.

Tennyson appeared to be unconscious as his head slammed against the ice after the hit. He slowly skated off with help from teammates before heading to the dressing room. After the game, head coach Peter DeBoer told reporters the 25-year-old is "likely concussed."

Reaves will certainly be hearing from the NHL's Department of Player Safety. The 29-year-old received a maximum $5,000 fine earlier this season for catching forward Anze Kopitar with a cheap shot during a Nov. 3 game against the Los Angeles Kings.