Hoylen's last official match goal was on May 9, when he helped Manchester United beat Athletic Bilbao 4-1 in the second leg of the Europa League semi-finals. This summer window, Hoylen went to Naples on loan from Manchester United.
In the second round of the Group C group stage in the European qualifiers, Denmark defeated Greece 3-0, and Hoylen made a substitute to break the four lunar drought. In the 81st minute of the game, Hoylen's former Manchester United teammate Duogu passed the goalkeeper and pushed the empty goal. Greek defender Mavropanos returned to chase and let the tackle to clear the ball, but the ball hit the post and bounced back. Then Hoylen, who followed in front of the goal, picked up a bargain, ending the 4-month ball drought (official game).