Not even the world's greatest hockey player is immune from illness.

Pittsburgh Penguins superstar center Sidney Crosby missed Tuesday's morning skate, and was later deemed to be feeling ill by head coach Mike Johnston.

Crosby, along with teammate Robert Bortuzzo, is set to undergo testing and further evaluation. His status for Tuesday's game against the New Jersey Devils is up in the air in the meantime.

Through 23 games, Crosby leads the NHL with 33 total points on nine goals and 24 assists.