The Portugal captain netted a pair of penalties in a 2-2 draw with world champions France in Budapest to send his team through as one of the four best third-placed sides.
Alexander Isak's second-half performance illuminated a hitherto tough-to-watch match against Slovakia.
Slovakia coach Stefan Tarkovic says defender Denis Vavro and a member of the team's coaching staff have tested positive for COVID.
Marek Hamsik joined IFK Gothenburg from Dalian Pro in China in March in a bid to get ready for the Euro.
Skriniar brought down a corner and toe-poked the ball into the net from 15 meters to earn Slovakia a 2-1 victory over Poland on Monday.
The Slovak government asked Health Minister Vladimir Lengvarsky to make the COVID-19 vaccine available by June 7.
The government's press department told AFP that Matovic had tested positive on Thursday and had since cancelled all his events.
Scotland scored all five penalties in the shootout after a 1-1 draw against Serbia, before goalkeeper David Marshall saved the home team's final spot kick.
Morocco are in Group B alongside Portugal, Spain and Iran, while Serbia are in Group E with Brazil, Switzerland and Costa Rica.
England manager Gareth Southgate played down the incident, saying Alli had been sharing a joke with team-mate Walker.
England midfielder Dele Alli says offensive gesture during FIFA World Cup qualifier against Slovakia was 'joke'
Video footage of Alli's gesture were widely shared on social media, but manager Southgate played down the incident.
Marcus Rashford atoned for a costly error to bring England a 2-1 home win over Slovakia in World Cup qualifier.