Liverpool star Alexis Mac Allister describes Argentina's victory in fiery World Cup qualifier against Brazil as like 'watching porn'

Liverpool star Alexis Mac Allister has bizarrely described Argentina's victory over Brazil as being like 'watching porn'.

Mac Allister played the full 90 minutes as Argentina beat Brazil 1-0 in a fiery encounter, marking the first time their rivals had lost a home World Cup qualifier.

After the game the 24-year-old was asked by TyC Sports what the victory was like, to which he hilariously replied 'porn'. 

Nicolas Otamendi scored the only goal of the game for Argentina, with Brazil's Joelinton being sent off.

The game was overshadowed by a mass brawl which broke out in the stands of the Maracana before kick off.

Rival supporters began fighting with one another during the Brazilian national anthem before clashing with police, forcing kickoff to be delayed by half an hour.

It is unclear what sparked the incident but rival supporters were seen shoving each other with some even ripping the seats from the stands and launching them.

Parts of seats flew around and hit some of the spectators behind one of the goals. At least one fan left the stadium bleeding from his head.

Argentina and Aston Villa goalkeeper Emiliano Martinez jumped up towards the stands and tried to grab a baton from a police officer's hands.

FIFA has confirmed it has launched an investigation into the match, with the Brazilian football federation charged with possible breaches of order and security and 'inappropriate behaviour' from supporters.

World football's governing body will also look into the conduct of the Argentina national team with regards to the delayed kick-off, as well as crowd disturbances.

Mac Allister has been capped 23 times by Argentina. He will hope to make an impact for Liverpool against Manchester City on Saturday.