Belenenses couldn't meet the minimum requirement of seven players on the pitch and the game was stopped.
The match between Belenenses and Benfica was abandoned on Saturday after the other team was forced to name a team of nine players, including two goalkeepers.
Belenenses returned with only seven players for the second period, after Benfica scored seven goals in the first half.
The referee abandoned the game two minutes after the break when Joao Monteiro, the goalkeeper playing in the middle, sat down on the ground and couldn't continue.
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Belenenses players and staff have been tested for COVID-19 following a positive test in the squad earlier in the week, the club's president told a news conference on Saturday.
The Belenenses players shared a message on social media before the game that said football only has heart if it is competitive. If it is really sporting, football has heart. Football is an example of public health. Football lost its heart today.
Soares told reporters that he tried to get the game postponed.
He said that they didn't want to play the game in the middle of the day. We were told that if we didn't attend the game it would be unjust because we had eight players who could attend.
It was a shame to be here today.
Soares told Saturday's news conference that defender Cafu Phete had tested positive for Covid after returning to Portugal from South Africa.
The cases in the squad could be related to the new Omicron variant, according to Soares. Researchers in South Africa and the World Health Organisation classified it as a variant of concern, saying it may spread more quickly than other forms.
Costa said that his side had no choice but to play the game.
He said that they didn't like entering the pitch under these conditions. "Benfica was forced to do it." I regret what happened today, a dark chapter for Portuguese football and the country itself.
The statement was released by third-rankedSporting.
"What made this situation possible must be reflected on by all those who defend the sporting truth and must deserve national attention at the highest level," it said.
It is already receiving international attention and marking another dark episode in Portuguese football.
