Mata was optioned to Triple-A Worcester on Sunday, Ian Browne of MLB.com reports.
Manager Alex Cora said in February that Mata could make his MLB debut this season, though it's still not a surprise the right-hander won't be on the Opening Day roster. The 23-year-old finished the 2022 campaign with Worcester after he was promoted in August, and he could see the majors before too long if he can replicate the 3.47 ERA he posted at Triple-A last season.