[1] He spent the 2015 season in the Chicago White Sox organization, but lost sensation in his hand, requiring surgery.

[3][4] He began the 2017 season with the Toledo Mud Hens of the Class AAA International League.

León posted a 3.15 earned run average in 21 appearances for Toledo before the Tigers purchased his contract on May 27.

[7] On January 29, 2018, León signed with the Guerreros de Oaxaca of the Mexican Baseball League.

On March 5, 2021, León signed with the West Virginia Power of the Atlantic League of Professional Baseball.