Titans assistant coach Jimmy Lenihan said No.6 Campbell sustained the injury early in the match before kicking 11 goals and scoring a try for a personal haul of 26 points.
After the match Campbell's hand had blown up like a balloon and he said he hoped it was just bruising.
"The physios weren't sure but they thought he might have a slight fracture in his hand," Lenihan told AAP on Sunday.
"It might be that or an exploded blood vessel but he will get scans.
"Jayden did it in the first five or 10 minutes of the game.
"He's always been tough. When I coached at Burleigh and he was in the under 20s I used to get the forwards to smash him up in opposed sessions and he was up for it. He was brave back then."
The last thing Campbell needs is another injury.
"Jayden has had a disrupted year after not having a pre-season after he dislocated his knee cap," Lenihan said.
"He came back and played three games and did his PCL. He was out for two months and that was his third game back where he was starting to find his momentum.
"Hopefully this (injury) won't keep him out for long, or at all."
JC reacts to breaking the club point record ‼️ — Gold Coast Titans (@GCTitans) pic.twitter.com/3B4zzjHIDIJune 22, 2024
Last week Gold Coast coach Des Hasler backed the versatile Campbell to succeed as as a long term five-eighth after he was criticised for his display against Wests Tigers.
"People seem to forget that I've only played two games there," Campbell said.
"I'm coming back from two knee injuries, so people don't understand that footy is not just a physical game, it's a mental game too.
"So, I just needed time to find my stride.
"I am hoping to pick up a lot of confidence from this game, but I know myself the player I am and where I can play.
"Having Des back me, it gives me a lot of confidence and makes me want to play my best footy for him."
Campbell's 11 goals, without a miss, was also the most ever by a Titan in a match.
"So growing up, I've always been a goal kicker but, we've got a fellow named Hilly (Andrew Hill) come in this year … a goal kicking coach," Campbell said.
"He comes in and he helps us a lot.
"He's just given me a few pointers, but if I think too much about it, that's when I start to miss goals.
"He just tells me to just make sure my run in is smooth and just kick the ball really.
"(Assistant coach) Brad Davis, he's helped me a lot too. So I really appreciate both of them."
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