Rainey was non-tendered by the Nationals on Friday, Andrew Golden of The Washington Post reports.
Rainey is coming off his first full campaign since undergoing Tommy John surgery. He understandably showed rust early on in 2024, but he managed a 2.88 ERA with a 22:11 K:BB across 25 innings following the All-Star break. That makes Friday's move mildly surprising, though Rainey should have the chance to latch onto another big-league roster.