Two players and a staff member on the Nagoya team tested positive for the virus, media reports said.
The first division of the J-League suspended play in February after only one round of matches had been played.
Nagoya Grampus forward Mu Kanazaki has tested positive for the coronavirus.
Japan's J-League to restart on 4 July after four-month delay; matches to be played in empty stadiums
Executives from Japan’s top football clubs voted to resume the season after restrictions were lifted across the country this week
Coronavirus Outbreak: Japan's J-League set to resume without fans after PM Shinzo Abe lifts state of emergency, says report
Japan's J-League started its season on 21 February but was forced to stop play a few days later due to coronavirus pandemic
Coronavirus Outbreak: Japan defender Gotoku Sakai tests positive for COVID-19, confirms club Vissel Kobe
Sakai, who has 42 caps for Japan, first reported having a fever on Wednesday and was diagnosed with acute upper respiratory infection in a hospital the following day
Coronavirus Outbreak: South Korean officials considering shortened K-League season, yet to settle on new start date
Representatives of the 12 clubs that make up the K-League met to discuss plans for the new season, which was halted ahead of its original 29 February start as the nation was hit by the coronavirus outbreak
Coronavirus pandemic: No relegation in Japan top flight this season with campaign disrupted, says J.League
The J.League season was only one match old when the decision was made to postpone matches. No fixtures have been played since 23 February.
Japanese officials postponed the start of the 12-team professional baseball league season on Monday because of the spread of the coronavirus
52-year-old Japanese striker Kazuyoshi Miura extends contract with Yokohama FC to enter his 35th season
Miura played in just three matches last year and did not score any goals but extended his record as the oldest player in the J-League.
FC Tokyo came into the last round of the season needing a victory by four goals or more for their first title but were unable to threaten Yokohama's solid defense
Ex-Barcelona star David Villa to retire at end of season, says he wanted to go on own terms, 'not be forced to retire'
Star striker David Villa, Spain's top goal scorer, announced on Wednesday he was quitting professional football at the end of the season.
AFC Champions League holders Kashima Antlers play out goalless draw at Guangzhou Evergrande in quarter-final first leg
It leaves the Antlers with a small advantage going into the return fixture on 18 September and was a successive stalemate between Japanese and Chinese teams after Urawa Reds drew at Shanghai SIPG on Tuesday
Premier League: J-League champions Kawasaki Frontale beat Frank Lampard's Chelsea via Leandro Damiao goal
Chelsea struggled to find the net despite waves of attacks over the course of the friendly, with Kawasaki players cautious in defence, particularly before the break
Barcelona said they paid 1.1 million euros ($1.25 million) for Hiroki Abe and assigned him to their reserve team, which plays in the third-tier Spanish Segunda B.
Fernando Torres will retire for good after taking on Andres Iniesta and David Villa in a J-League match on 23 August. His side Sagan Tosu currently sit bottom of the J-League with four wins from 16 matches.
Fernando Torres, the former Atletico Madrid, Liverpool and Chelsea forward who won the World Cup with Spain, announced on Friday he was retiring.
J-League: Andres Iniesta named new captain of Vissel Kobe after Lukas Podolski steps down citing lack of 'honesty'
Despite having World Cup winners Iniesta, Podolski and David Villa in their ranks, Kobe sit in 11th place in the 18-team league having lost three of their last four games
Before signing with Vissel Kobe, former Barcelona striker David Villa spent four seasons with New York City FC, scoring 80 goals in 124 MLS appearances
Bundesliga: Bayern Munich winger Arjen Robben is reportedly lining up move to J-League outfit FC Tokyo
Superstar Dutch winger Arjen Robben is lining up a move to J-League outfit FC Tokyo after he leaves Bundesliga giants Bayern Munich, local media reported on Tuesday.