Porto's match against Estoril was abandoned on Monday after concerns were raised about a stadium collapse.
The Portuguese giants were 1-0 down when the Primeira Liga clash was halted at half-time amid fear over the structure of the Estadio Antonio Coimbra da Mota.
Approximately 2,500 supporters were advised by local police to evacuate their stand with thousands racing across the pitch towards the home end for safety.
Por problemas na estrutura de uma bancada do estádio, os adeptos foram evacuados para o relvado, por indicação das forças de segurança. A 2ª parte ainda não começou.#FCPorto #GDEPFCP pic.twitter.com/nLfHQ729Fa — FC Porto (@FCPorto) January 15, 2018
But after consulting with police and security, the officials decided that the second half could no longer be played with fears of over-crowding also surfacing.
ja vi melhores balneários em campeonatos distritais em equipas que estavam em grandes dividas agora uma equipa de primeira liga que a uns anos teve na liga europa inadmissível.. mas sendo o Porto não vão dar os 3 pontos . Estoril #FcPorto pic.twitter.com/jt82GrLCVN — Fabio Alves (@Mynamesfabio3) January 15, 2018
Estoril's home was built in 1939 and pictures emerged on social media appearing to highlight obvious cracks in the structure of the ground.
Porto - who were looking to reclaim top spot in the Primeira Liga prior to the match being abandoned - released a statement to confirm a new date for the tie has yet to be agreed with Estoril.
The statement read: "The match Estoril - FCP, scheduled for this Monday evening, for matchday 18 of Liga NOS, has been suspended at half-time, for safety reasons.
"No date to resume the match has been set, as the decisions will have to be reached by agreement between both clubs - off the table is the chance to play it on Tuesday, January 16."