Davidi reports Matz will have to isolate for at least 10 days starting from when he received the positive PCR test.
The club placed the left-handed starter on the COVID-related injured list Sunday.
As of last Monday, the Blue Jays had more than 85 per cent of Tier 1 individuals vaccinated, which allows for reduced protocols at and away from the ballpark. It is not publicly known whether Matz has been vaccinated.
Matz last pitched in the team's 7-2 win over the Boston Red Sox, when he threw 5.2 innings, scattered four hits and gave up just a single earned run as he picked up his seventh victory of the season.
The 30-year-old has put together an impressive campaign with the Blue Jays, his first with the club after an off-season trade from the New York Mets. Matz boasts a 7-3 record with a 4.26 ERA and 75 strikeouts.
The Blue Jays wrap up their four-game set vs. the Red Sox on Monday at 7:10 p.m. ET / 4:10 p.m. PT on Sportsnet ONE and SN Now.