It came three days after Jurgen Klopp’s side continued their unbeaten run with a 4-0 win over the Saints.
Oxlade-Chamberlain opened the scoring with a powerful drive two minutes into the second half.
But new footage from the game shows the Englishman was well prepared for the situation.
In the clip, the players are on the pitch at Anfield warming up.
And the forwards are running shooting drills at goalkeeper Adrian.
Oxlade-Chamberlain is first, taking control of the ball from the coach.
After taking a touch on the left side of the penalty box, the 26-year-old drives low towards goal.
And his effort rifles into the bottom-left corner, leaving Adrian rooted to the spot.
This footage has been viewed more than 650,000 times since it was shared on the club’s official YouTube channel on Tuesday.
And the Anfield faithful were amazed at the similarity to his opener.
“That’s how the Ox practised his goal,” one supporter said.
Another commented: “That’s muscle memory.”
While a third heaped praise on the forward.
“The Ox is a beast,” they said.
And a fourth added: “That was freaky.”
With a fifth simply saying: “Beast.”
Oxlade-Chamberlain’s strike was followed by a cool strike from captain Jordan Henderson.
While Egyptian superstar Mohamed Salah added two of his own against the Saints.
Klopp’s side will return to action on February 16 when they travel to Norwich.
And several of the Reds stars have jetted off to chase the sun during the winter break.