Why Arsenal's Biggest Weakness Was Exposed Against Porto

Arsenal face an uphill struggle in their Champions League knockout after a bruising 0-1 defeat to Porto. But after dishing out consecutive hammerings to West Ham and Burnley in the Premier League, what suddenly went wrong for Arteta's men in Portugal? Adam Clery picks through the game and finds their old Achilles heel has returned. SUBSCRIBE: https://bit.ly/3ErE4ai WEBSITE: https://bit.ly/3GFXMC0 Follow FourFourTwo on: Instagram: https://bit.ly/3VoHkKz Facebook: https://bit.ly/3UgQYxX Twitter: https://bit.ly/3GB0Or7