Lamoriello said Boychuk suffered no damage to his eye.
"He had quite a night. ... He felt the skate blade hit his eye, but fortunately it just got the eyelid and they took 90 stitches to fix,"Lamoriello said. "He'll be fine. It's just a matter of time with the eye opening up."
There is no timetable on his return.
In a tweet Wednesday, Boychuk thanked those who wished him well after he was hurt.
Both players were in front of the New York net when Lehkonen appeared to lose his balance and fall forward, causing his legs to kick back and his right skate to connect with Boychuk's face as he looked downward.
Boychuk immediately went down to the ice with his hand covering his face before skating off in pain.
The Canadiens won the game 6-2.
Boychuk needs 90 stitches after taking a skate to the face
Islanders defenseman Johnny Boychuk rushes off the ice after taking an inadvertent skate to the face during the Islanders' loss to the Canadiens.