There was concern Kell Brook’s right eye wouldn’t hold up vs. Errol Spence Jr.

After all, Gennady Golovkin fractured the right orbital bone with his fists during a fifth-round stoppage in September, and Brook was forced to undergo surgery.

It turned out the worry was misplaced because Brook’s right eye looked just fine during his IBF welterweight title defense Saturday in Sheffield, England, against Spence. It was the left eye, this time, that was badly injured, and Brook revealed to Sky Sports on Sunday that the left orbital bone is fractured and may require surgery.

Spence unloaded with southpaw jabs, and soon, the left eye was badly swollen. By the middle rounds, it was closed shut. Spence dropped Brook in Round 10, and one frame later, the Brit couldn’t stop blinking and took a knee before signaling to referee Howard Foster that he couldn’t continue.

“They kept me in until about 3 a.m. (local time). I had a CT scan on my eye and the eye is broken again, same as the Golovkin one, so, maybe surgery again,” Brook (36-2, 25 knockouts) said. “I’m devastated. I knew from Round 7 that the eye had gone and progressively as the rounds went on. I tried to get through the fight and it kept going double vision and then coming back into line.

“In the later rounds, 10 and 11, especially 11th round, it stuck there and that’s why I went down on one knee and I remember the surgeon saying to me after the Golovkin fight ‘if you would have gone another round or so you could be blind’ so I’ve got that going through my mind as well.”

The next time Brook fights, he could do so with two surgically repaired eyes, and it’s sure to take a toll on his psyche.

But what weight will Brook compete at? Promoter Eddie Hearn implored Brook to settle at 154 pounds after moving up 13 pounds to challenge Golovkin for the middleweight belts.

“I think the time is now maybe to move up,” Brook, 31, said. “I’ve been making welterweight since I was a teenager. My first fight I was about nine or ten. I went up to middleweight in my last fight, I put a lot of muscle on and it was so hard to get to welterweight.”

As the bout was stopped and Spence as crowned champion, Brook said he recalls thinking “I live to fight another day.”

Just what kind of condition he’ll be in next time he laces them up remains to be seen.