The Blue Jays selected Ramirez's contract from Triple-A Buffalo on Friday, John Lott of The Athletic Toronto reports.
The converted position player did not allow a run across 37.2 innings combined with Double-A New Hampshire and the Bisons, over which he struck out 45 and walked only 10. Ramirez may have a future as a high-leverage reliever, and his strikeout ability may make him useful in AL-only leagues for the season's final month.