The Reds No.10 initially appeared to be offside when he converted Mohamed Salah’s knock across the box midway through the first half – but a Video Assistant Referee review correctly confirmed he had been onside.
Mane’s breakthrough halted a dangerous passage of play by the hosts at Estadio do Dragao and led to an ultimately emphatic victory for Jürgen Klopp’s men in the last-eight second leg.
Salah, Roberto Firmino and Virgil van Dijk also found the net after the interval to seal a 6-1 aggregate result, with Eder Militao providing a consolation for Porto.
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“I was thinking it was offside, to be honest,” Mane told BT Sport when asked for his take on the 26th-minute opener.
“I told the boys to keep going and they said, ‘No, wait.’ I was surprised. It was an important goal but the more important thing was to qualify for the semis and we did it – it’s great.
“The beginning was tough. I think the team spirit was great; we never gave up, we tried to push hard as a team. We created many chances and scored many goals, so I think we deserved the win.”