Bayern led the table by four points when the season was halted on March 13.
A medical source also confirmed to AFP the existence of this letter but added that the doctor had appeared "to be in good shape two days ago".
Tommasi spoke a day before a video conference meeting between Serie A clubs in which player salaries will be on the agenda after failing to strike a deal with the AIC.
The idea of simply declaring the season over is gaining ground in some quarters but others remain strongly opposed to the suggestion.
There has been considerable criticism from former players, who believe the safety net is not being used as intended.
The England defender has said sorry after it was widely reported he held a party at his home last week, breaking the government's rules on social distancing
Initial talks were already ongoing before key political figures, including Health Secretary Matt Hancock, called for action.
Callejas passed away of a heart attack in a hospital in Atlanta, Georgia, his family said.
Clubs and players' representatives discussed a combination of pay cuts and deferrals amounting to 30 percent of annual salary.
Newcastle, Tottenham, Bournemouth and Norwich have also said they would furlough non-playing staff.
Premier League stars, currently out of action due to the global pandemic, have come under fire after a number of clubs furloughed non-playing staff but left players' wages untouched.
Ireland Under-21 team's coach Kenny was originally due to take over from McCarthy in August.
FC Istiklol came from behind to beat FC Khujand 2-1 in the Super Cup game heralding the beginning of the football season, which took place behind closed doors.
UEFA has threatened to ban all teams from European competitions next season if they did not complete their league season.
The Premier League said on Friday that the 2019/20 season would only return when it was "safe and appropriate to do so".