Five people have been arrested and an investigation is underway after a Manchester City supporter was attacked following its Champions League game at Club Brugge, Belgian authorities said on Wednesday.

The incident took place at a parking lot in Drongen after City's 5-1 win over Brugge on Tuesday. The Belgium-based supporter, 63, is in "mortal danger", the East Flanders public prosecutor's office said in a statement.

"A man wearing a Manchester City scarf had stopped the car in the motorway parking in Drongen after the match and had made his way to the shop," it added.

"According to the first findings of the investigation, his football scarf in the shop was taken off by a suspect and he stepped out with it. Subsequently, the victim came into confrontation with some suspects in the parking lot, and ended up on the ground after physical aggression."

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Manchester City said it was shocked by the incident.

"We're currently working with our counterparts at Club Brugge as well as Belgian and Greater Manchester Police to establish more information," City said in a statement.

"Our thoughts and best wishes go out to the family and friends of the Belgian-based supporter, who remains in hospital."

Brugge said in a statement that it was "horrified" to learn of the incident.

"Club Brugge strongly disapproves of all criminal behaviour, both inside and outside the stadium and puts tolerance first," the club said.