minor league

Translations
второстепенная лига
He started his career in the minor league before moving up.
Он начал свою карьеру во второстепенной лиге, прежде чем подняться выше.
Definitions
A minor league is a professional sports league that is considered to be below the major leagues in terms of skill level, prestige, and financial resources. It often serves as a developmental platform for players, coaches, and officials, allowing them to gain experience and improve before potentially moving up to the major leagues.