Liverpool's Alexander-Arnold explains his genius moment that dumped Messi out of Champions League

Liverpool's Georginio Wijnaldum celebrates scoring their third goal with Jordan Henderson and Trent Alexander-Arnold. [Reuters]

Alexander-Arnold said the quickly-taken corner that led to Liverpool's decisive fourth goal in their incredible 4-0 victory over Barcelona in the Champions League semi-final on Tuesday was pure instinct.

The 20-year-old right back had already helped set up Liverpool's second goal with a pass for Georginio Wijnaldum when, with the aggregate score tied at 3-3, the ball went out behind the Barcelona goal in the 79th minute.