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Matt Albers is on paternity leave (which can last 3 days according to the CBA), and Josh Zeid replaces him in the bullpen. Zeid has pitched 1.2 innings of scoreless relief for Oklahoma City.
Zeid has experience in the Astros' bullpen last year; so this is not a surprising choice to replace Albers. Most likely it is temporary. But I'm sure Zeid would like to impress the Astros' brass and increase his odds of staying when Albers returns or getting a call up later.