"There was a little hint of jealousy I think", he hilariously said.
'Maybe he can't accept the fact that he chose to go back to short hair!'
Fellaini now faces a nervous wait to see if the FA will take any retrospective action.
Fellaini will not face retrospective action for the foul, and Emery saw the amusing side by suggesting Guendouzi could follow in the Belgian's footsteps and get a new haircut.
Robert Huth - who won the Premier League title with both Chelsea and Leicester City - picked up a three-match ban for violent conduct in May 2016 when he was caught pulling Fellaini's own hair during a clash with the Red Devils.
Given Huth's previous punishment there is a chance that Fellaini could be facing another retrospective ban if the Football Association deem his actions to come under the violent conduct umbrella.
An out-of-sorts United side met an in-form Gunners outfit that were on a 19-game unbeaten streak prior to the tie at Old Trafford on Wednesday night.