Almiron broke free of the Southampton defence with the score locked at 0-0, and the winger shot from a tight angle, rather than pulling the ball back for a Newcastle teammate.
The shot nearly went in, but Benitez felt that the American should have passed.
"I think he made a mistake [against Southampton] with the chance he had because he had two options, but everyone was saying 'shoot' because they want him to score a goal,” the Spanish boss said.
"There was a chance to play wide, but he has been really important for us. He has been a good addition and I am really pleased for him.”
Even though Almiron’s decision making wasn’t flawless in the final third, Newcastle were not made to pay.
The Magpies went on to win 3-1 against Southampton, with Almiron impressing during his time on the pitch.
Unfortunately for the rapid wide-man he was forced off with injury, which means that he could miss the rest of the season.
Almiron was visibly distressed when leaving the St. James’ Park pitch, and there are fears that Newcastle will now be without him for their final three matches.
Newcastle are next in action against Brighton & Hove Albion on Saturday evening.
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