Suero was non-tendered by the Nationals on Tuesday, Jesse Dougherty of The Washington Post reports.
Suero entered 2021 as a solid bullpen piece for Washington over the previous three years, but he struggled last season with a 6.33 ERA, 1.41 WHIP and 44:15 K:BB over 42.2 innings. He may need to settle for a minor-league deal this offseason.