Michael Porter Jr. likely has suffered — and overcome — more back injuries than any player in the NBA.

But Friday, the talent-starved Nets got a good look at their offense with Porter sidelined by fresh back woes.

It wasn’t pretty.

The shorthanded Nets struggled through an ugly 115-103 NBA Cup loss to the visiting 76ers before a sellout crowd of 17,809 at Barclays Center.

Already without Cam Thomas, the Nets played sans Porter, sidelined by low back tightness.

They can downplay it all they want, but it will set off alarms when Porter is sidelined with such a familiar issue.

The way they looked Friday will raise more alarms.

The Nets shot 40.5 percent, and just 13 of 43 from deep.

Trailing 42-31 after a Terance Mann jumper, the Nets allowed a 12-2 run as the game slipped away.

The

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