It was reported earlier that the league would review the incident, which occurred after Ottawa scored a controversial goal in the game's final minute.
League disciplinarian Brendan Shanahan issued a warning to Senators general manager Bryan Murray, but Michalek escaped without either a suspension or a fine.
There has been precedent for discipline on such plays.
Carolina's Jeff Skinner and Anaheim's Bobby Ryan both earned two-game suspensions for similar incidents in the past.
Katie Strang is a hockey writer for ESPNNewYork.com.