After fumbling possession in his defence 50, Cottrell was placed over the ball before being met by Harmes at the contest, with the premiership Demon moving into a bumping action as he braced for contact.
The collision saw Harmes penalised for high contact after his left shoulder made first contact close to Cottrell's head.
James Harmes has been handed a one-match suspension for this bump on Matt Cottrell. pic.twitter.com/Kbd0dNpXhq
— AFL (@AFL) June 3, 2023
Harmes' actions have been graded as careless conduct, medium impact and high contact, resulting in a one-game suspension for the 27-year-old.
Melbourne has already ruled out defender Jake Bowey for the match against the Magpies due to concussion, while Simon Goodwin is set to have Clayton Oliver (hamstring) and Michael Hibberd (managed) available for selection.
Harmes was brought into the game against the Blues as the tactical sub midway through the third quarter after Bowey suffered a head knock, notching up his sixth appearance of 2023.
Not other incidents were cited from Friday's match.