All matches are being played behind closed doors but videos posted on media websites showed an estimated 200 Porto fans gathering behind barriers outside the stadium, singing and waving flags.
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Here are five to watch out for when the top-flight Portuguese Primeira Liga resumes on Wednesday after being disrupted by the COVID-19 pandemic.
European football talking points: Barcelona benefit from goalless Madrid derby, AC Milan hit 81-year low and more
Barcelona took advantage of their rivals drawing in the Madrid derby to close the gap atop La Liga but it was a bad weekend for AC Milan and pressure is building on novice coaches at some of Europe's most famous clubs.