ABU DHABI, U.A.E. — A back injury kept Josh Hart out of Saturday’s preseason victory over the Sixers.

The official diagnosis from the Knicks was “spasms,” with a team representative downplaying the severity.

“It’s preseason and we’re going to err on the side of caution,” the rep said. “We’ll see where he is when [we get home].”

The Knicks flew back to New York on Saturday afternoon and will next play Friday against the Timberwolves at the Garden.

Josh Hart injured his back in the Knicks preseason opener. AP

Hart collapsed to the court in pain in the second quarter of Thursday’s preseason opener, then retreated to the locker room while holding his lower back.

The forward had also been ejected because he threw the ball into the stands while lying on the hardwood. He wasn’t available

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