The Astros designated Anderson Hernandez for assignment to make room for Geoff Blum, according to MLB.com's Brian McTaggart (Twitter link). The Astros claimed Hernandez from the Indians in late July, after Cleveland designated him for assignment.
The 27-year-old utility player has appeared at second, third and short this year, and he has also played a game in left field. However, Hernandez has just a .230/.260/.284 line in 77 plate appearances. That isn't far from the .617 OPS he has posted in his six-year MLB career.