Benjamin Sesko's goal for Manchester United against Liverpool was allowed to stand because there was no definitive proof of handball, according to referees' chief Howard Webb.
Sesko scored United's second goal in a 3-2 victory at Old Trafford on 3 May.
Liverpool boss Arne Slot voiced his frustration that the video assistant referee did not intervene to disallow the 14th minute goal.
The Slovenia international had bundled the ball home from close range, and it looked like his fingertips may have brushed it before it went in.
"I think it probably does hit the hand," Webb said on Match Officials Mic'd Up.
"But of course, the VARs need [to see] that conclusively. They need to be absolutely certain that it does.
"Clearly, Sesko doesn't deliberately handle this. He doesn't make himself bigger. It's all very natural.
"But, of course, the laws of the game require any goal that comes off the hand immediately to be disallowed.
"That means the VAR has no option but to start looking for that.
"Sometimes it looks like they're being a bit too forensic, and you hear, in this situation, the VAR looking from various angles.
"They want to get it right.
"They need to be absolutely categorical to get involved, and they weren't able to find [the evidence], and hence the reason that the on-field decision stood."
