The severity of Tanev's injury is unknown at this time, but it could be a significant blow to the Leafs. Not only is his absence a loss in a crucial game, but it could also affect the team's long-term plans, especially with the playoffs in mind. Tanev, who signed a six-year contract this summer, was brought in to be the defensive anchor Toronto desperately needed. He had a total of 207 blocked shots last season and finished third in the NHL.