Free agent guard Mike Conley Jr. has agreed to a one-year deal to sign with the Boston Celtics, sources tell ESPN. Conle Via @ShamsCharania on X

What happened: Veteran guard Mike Conley Jr. has agreed to a one-year deal to sign with the Boston Celtics, according to ESPN. The agreement keeps the 20-year veteran in Boston's backcourt after he weighed a handful of offers before deciding. Conley becomes only the 14th player in NBA history to reach 20 seasons.

Why it matters: Retaining Conley gives Boston a steadying, playoff-tested ball-handler and locker-room presence on a short-term commitment. The one-year structure preserves the Celtics' flexibility while adding proven depth in the backcourt. Reaching a 20th season places Conley among the rarest longevity company the league has ever seen.

By the numbers: Conley joins an exclusive group as just the 14th player in NBA history to appear in 20 seasons.

What to watch: Watch for how Boston deploys Conley's minutes and mentorship role as the roster takes shape for the 2026-27 season. His durability across a 20th campaign will be a storyline to track.

Sources