Late in the second period of what ended up being a 6-5 Lightning victory, Johnson cross-checked Namestnikov who fell hard into the boards behind the Colorado net.
Johnson received a slashing minor, boarding major and a game misconduct for the play. Namestnikov was able to return to the game the following period.
The Lightning lost Ryan Callahan earlier this week after the forward crashed into the boards in a game against the Coyotes.
Namestnikov has 13 goals and 15 assists in 32 games this season playing on a line with Steven Stamkos and Nikita Kucherov.