Martin O'Neill has admitted that VAR's failure to determine an offside decision left him puzzled.
The technology was unable to give a definitive verdict on the final goal in Celtic's match against St Mirren, causing officials to abandon the calibrated offside lines.
Instead, the referee was sent to the pitchside monitor to make the call. O'Neill said: "They couldn't draw the lines just based on where the defender was and where Shim Mheuka was.
"I think he was essentially blocking where the defender was. They couldn't draw the line, so the referee was told to go to the screen to then basically determine with his eye whether the striker was offside or not."
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The former Celtic boss, aged 74, expressed his disagreement with the referee's decision, but acknowledged he had not seen the evidence the officials were working with. He said: "I didn't agree with him, but I didn't see the lines."
O'Neill also voiced his concerns about the reliability of VAR, given its purpose to eliminate uncertainty from key decisions. He said: "I think it's frustrating in that sense that you think in this particular day and age that you could get lines drawn properly.
"But I think it's been a bit of a problem here for a while."
Despite his concerns, the former Celtic boss took a pragmatic approach, recognising that the technology can sometimes work in his favour. He said: "I'm not complaining because we won!"
