Nimmala's parents immigrated to the United States from India. As a youth, Nimmala primarily played cricket and spent his summers visiting his relatives in Vijayawada, Andhra Pradesh. His family spoke Telugu at home. He lives in Valrico, Florida.
The Toronto Blue Jays selected Nimmala in the first round, with the 20th overall selection, in the 2023 Major League Baseball draft. He signed with the Blue Jays on July 17, 2023, for a below slot value of $3,000,000. Nimmala appeared in nine games for the Rookie-levelFlorida Complex League Blue Jays, batting .200 with three RBIs, and 14 walks against eight strikeouts. In 2024, Nimmala played primarily for the Low-ADunedin Blue Jays, appearing in 90 total games and batting .232 with 17 home runs, 47 RBI, and nine stolen bases. Nimmala played the entire 2025 season with the High-AVancouver Canadians. In 120 games, he hit .224 with 13 home runs, 61 RBI, and 17 stolen bases. At 19 years of age, Nimmala was one of the youngest players in High-A in 2025, and played against competitors who were, on average, 3.3 years older than him.
Los Angeles Angels
On August 3, 2026, the Blue Jays traded Nimmala, along with Eddie Micheletti and Angel Rivero to the Los Angeles Angels in exchange for José Soriano.