The Astros have designated righty Jake Buchanan for assignment, Evan Drellich of the Houston Chronicle reports on Twitter. He lost his spot to clear space for the team’s call-up of lefty Joe Thatcher.

Buchanan, 25, has thrown 44 1/3 MLB innings over the last two years, with most of that experience coming in 2014. He has a 4.06 ERA in that span with 5.1 K/9 against 3.2 BB/9.

Prior to 2014, Buchanan had worked primarily from the rotation. But he’s thrown mostly in relief since. This season, over 80 1/3 Triple-A innings, he owns a 4.37 ERA while strike out 5.0 and walking 2.4 batters per nine.