Houston optioned Bielak to Triple-A Sugar Land on Sunday, Matt Kawahara of the Houston Chronicle reports.
Bielak was once again ineffective in his outing Saturday, allowing five runs (four earned) on five hits over 4.2 innings versus the Reds. The right-hander will get a chance to iron things out at the minor-league level, and Houston recalled Shawn Dubin from Sugar Land in a corresponding transaction.