It remains to be seen what the actual cause of his injury was but on his final shift before heading into the locker room, Lagesson was seen out-stretching for a loose puck that just left the offensive zone before having to chase it down.
With the Leafs having just 5 actual defensemen active in Saturday's game, head coach Sheldon Keefe was forced into using forward Mitch Marner as a defender.
The 27-year-old Lagesson has been in and out of the lineup this season but has appeared in 25 games to date. He has averaged 14:53 TOI, has no goals, and 3 assists, with an even rating.
His loss won't affect the Maple Leafs too much tonight with the club ripping the Anaheim Ducks apart with an 8-1 lead through 2 periods. However, if he is out long-term, they will have to make yet another a call-up in the next coming days with the St. Louis Blues on deck on Monday - unless, of course, Morgan Rielly's suspension is reduced to 3 games, allowing him to play on Monday.