The Edmonton Oilers forward was hit on the side of the head with an attempted shoot-in by Oilers defenseman Ryan Shea. Nugent-Hopkins left the ice immediately and did not return.
The 33-year-old has 11 points (four goals, seven assists) in nine games. He missed the first nine games of the season with a lower-body injury and made his season debut in a 6-5 shootout win against the Carolina Hurricanes on Oct. 22.
Nugent-Hopkins broke the Oilers all-time games played record in a 4-3 shootout loss at the New Jersey Devils on Tuesday, playing in his 1,038th game.
Selected by Edmonton with the No. 1 pick in the 2011 NHL Draft, Nugent-Hopkins is in his 16th season and has 815 points (295 goals, 520 assists) in 1,040 games.