The Halos called up pitchers Cam Bedrosian and Fernando Salas from the Class A Advanced Inland Empire. Manager Mike Scioscia said both would be available for Sunday's series finale.
Roth, who was called up prior to the Rays series, pitched 4 2/3 innings of relief in Saturday's game, throwing 87 pitches.
"In that game, you want to get a chance to get back into the game -- if he's ever gonna give you the length -- and Mike did that," Scioscia said. "We had numerous opportunities. And if you're not gonna win the game, you want those guys to really earn it with some pitching."
Scioscia said Roth's performance forced the Rays into using multiple relievers of their own -- Joel Peralta and Brad Boxberger -- in a game that otherwise could have turned into a blowout early.
But with Halos starter C.J. Wilson lasting just 1 1/3 innings and Thatcher going on the DL, the Angels needed more depth in their bullpen on Sunday.
"[Roth] understands the situation, he understands the need to get some fresh arms here -- and it was important what he did last night, even though we didn't win the game," Scioscia said. "I think in the big picture, there's a very tangible improvement we've seen in Mike from where he was last year. He's gonna pitch in the big leagues and he's gonna help us in the future."
David Adler is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.