Bielak will start the Astros' first Grapefruit League contest Sunday, Jake Kaplan of The Athletic reports.
Bielak contributed significantly to the Astros in 2020, throwing 32 innings both as a starter and reliever. However, he didn't have consistent success, posting a 6.75 ERA and 1.75 WHIP with a 26:17 K:BB. Houston made a number of additions to its bullpen this offseason -- the most significant of which were Pedro Baez and Steve Cishek -- which means Bielak is likely to begin the season at Triple-A Sugar Land.