Hearts manager Robbie Neilson was frustrated over the way his side conceded their equaliser against Celtic after claiming Toby Sibbick was fouled by Callum McGregor.
The Hoops won 4-1 despite conceding an early opener to Ellis Simms, putting them on the verge of winning the Premiership title.
The second goal was also disputed but footage showed the ball was just over the line before Craig Gordon clawed away Kyogo 's header.
On the equaliser, Neilson said: "It is a free-kick to be honest. I have seen it again and am pretty sure you will agree.
"These key decisions when you come here, you have got to get them. That was the disappointment with the ref. I thought it was a pretty simple one to get and he doesn't get it right.
"The second one for the goal is the right decision - borderline but right."
Neilson waited for referee Don Robertson at half-time but did not push his complaints.
"To be honest, it is not worth it," he said. "Don was the same at Easter Road so I will just keep my mouth shut. We have a big game coming up in a couple of weeks."
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