Mitchell had surgery on his knee in the offseason and re-injured it during the lockout. He had been trying to rehabilitate his leg during the season, but ESPN's report states that Mitchell had arthroscopic surgery on the injured knee and will miss the remainder of the season.
The veteran blueliner had career-bests of five goals and 24 points in 76 games last season, and was a plus-7 in helping the Kings win the first Stanley Cup in franchise history.
Hopefully [Jonathan] has a year that pushes us, that is the organization, to speak to him next summer and looking for [a long-term contract]. Because the thought process is trying to get a goaltender, and hopefully it's Jonathan, to be the stabilizer for this franchise.
— Maple Leafs GM Lou Lamoriello on goaltender Jonathan Bernier