Ronaldo had been separated from the rest of the Portugal group after testing positive for COVID-19 on Monday. He was said to be asymptomatic and in good health condition.
France's 7-1 thrashing of Ukraine was the pick of the European friendlies on Wednesday as Spain clung on for a draw in Lisbon and Turkey saved pride with a late goal against Germany in Cologne.
The Portuguese league is due to resume on Friday behind closed doors. Sporting's opening game is on Saturday at home to another hard-hit club, Gil Vicente.
UEFA Nations League: Cristiano Ronaldo says playing in front of empty stadiums is like 'going to a circus without clowns'
Ronaldo said he hoped that “within a few months” fans could be back because they are the “joy” of the game.
Portugal play Sweden on Tuesday in Solna, the scene of a memorable Ronaldo display in the second leg of a World Cup qualifying playoff in 2013.
Gareth Southgate's men also survived going down to 10 men and seeing Birkir Bjarnason miss a late spot-kick for the hosts.
UEFA Nations League: Portugal coach Fernando Santos doubtful of Cristiano Ronaldo's availability for Croatia clash
The five-time Ballon d'Or winner has not played since early August when Juventus were knocked out of the Champions League by Lyon.
Champions League: Atletico Madrid report two positive COVID-19 cases ahead of quarter-final against Leipzig
Atletico Madrid on Sunday reported two positive coronavirus tests, just four days before they face Leipzig in Portugal for a place in the Champions League semi-finals.
Mugello will be the fourth Italian circuit to host a championship grand prix, after Monza, Imola and the Pescara road course.
Two Benfica players injured as attackers pelt rocks on team bus after goaless draw against Tondela: Report
Portuguese soccer federation president Fernando Gomes described the attack on Benfica players as 'a cowardly and barbaric act' which 'has stained soccer’s image.'
Portugal's Primeira Liga next in line to resume in Europe amid fears of fans gathering outside stadiums
Portugal's Primeira Liga will resume this week as European football continues to make its gradual return amid the coronavirus pandemic.
Porto lead the 18-team table with 60 points from 24 matches, one ahead of bitter rivals Benfica, with Braga a further 13 points adrift in third.
Portugal, preparing to restart its professional soccer league on 30 May, will not automatically order entire squads to be quarantined if one or more players test positive for coronavirus.
Coronavirus Outbreak: Setback for Portugal's Primeira Liga as three Vitoria Guimaraes players test positive for COVID-19
The Primeira Liga, suspended since mid-March, is set to re-start on 30 May and teams began training last week.
Coronavirus Outbreak: Portuguese football’s second division season declared over; CD Nacional, Farense promoted to Primeira Liga
Portugal’s professional football league has declared the second division season to be over with 11 rounds of matches to play and promoted CD Nacional and Farense, it said in a statement.
European champions Portugal donate half of Euro 2020 qualifying prize money to support amateur football
The support fund is expected to share a total of € 4.7 million ($5.13 million) among regional associations and amateur clubs.
Sporting to cut player wages by 40%, board to take 50% pay cut during coronavirus crisis, says report
With the pandemic shutting down global sport on an unprecedented scale, Sporting is the first of Portugal’s three major football clubs to announce the cuts.
The novel coronavirus pandemic has already affected and reshaped the professional sports landscape in Europe and is now forcing cancellation and postponement of sporting events across the globe.
The group phase will start in September, after Portugal tries to retain its more significant title at the 12 June - 12 July European Championship
Coronavirus outbreak: Portugal confirms two cases; infected patients hospitalised, both in stable condition, says health minister
Both had recently returned from abroad, Health Minister Marta Temido told a news conference