When the Brooklyn Nets took the Boston Celtics in Game 4 on Monday, there was a key figure missing on their bench: Ben Simmons.

After his interesting wardrobe choice in Game 3 that really stood out from the Nets' bench, Simmons was largely expected to be seen again as the series returned to Boston. Interestingly, however, he was nowhere in sight throughout the contest.

While everyone already knew he wouldn't play because of a sudden setback in his recovery from back injury, many were actually hoping that he would at least cheer for his Nets teammates. But that wasn't the case on Monday.

Of course, as Ian Begley of SNY.TV reported, Simmons' absence has everything to do with his recent back ailment.

Ben Simmons was initially projected to suit up for Game 4. However, he was ruled out after reportedly feeling soreness in his back. The Australian playmaker was heavily criticized for the development, with many saying that he has no competitive fire at all.

With the Nets down 3-0 at the time, they could have really used his help.

Sure enough, the backlash will only grow further after his latest vanishing act. Not to mention that with the Nets getting swept by the Celtics, he has put himself in a position to be on the receiving end of more criticisms.

Hopefully, though, Simmons will be ready to suit up for Brooklyn come the 2021-22 season.