"It doesn't feel the best at the minute but I'll get a scan tomorrow", he said following the full-time whistle at Anfield.
Barcelona striker Luis Suarez said his side "looked like schoolboys" for Liverpool's winning goal in the Champions League semi-final second leg. He quickly played the ball in hard and low, right into the feet of Divock Origi, who simply had to make sure he hit the target with his effort to score such was the pace on the ball.
But the 24-year-old Belgian has made a habit of scoring important goals in Liverpool's title challenge and had his first ever in the Champions League on seven minutes on the rebound after Marc-Andre ter Stegen had denied Jordan Henderson's initial effort.
Even former rival Jose Mourinho could only tip his cap towards Liverpool boss Jurgen Klopp while speaking as a pundit for beIn Sports.
"When they scored the goal, when they were pressing so high, it was really hard".
Liverpool Football Club sealed a win for the ages, when they beat FC Barcelona by four-nil in the Champions League semifinal.
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It was Alexander-Arnold that delivered the clever corner kick from which Origi swept home their fourth goal.
Some statement from a player who played over 500 times for the Reds and was there in 2005 in Istanbul for that famous Champions League comeback.
The result means that Liverpool head to the final for the chance to win their sixth European crown. The English club lost last year's UCL decider 3-1 to Real Madrid.
Once again the Catalan giants, who last won the Champions League in 2015, wilted when the stakes were highest.
Barcelona's Lionel Messi looks dejected during his team's loss to Liverpool on Tuesday.
"When you have a collapse of this nature", Barcelona coach Ernesto Valverde said, "we will have a few awful days ahead".
"I think it was just instinctive", Alexander-Arnold told BT Sport. His pass from the corner found a wide-open Origi, who steered a shot into the top corner with his first touch.