Takahashi had his fair share of struggles this season with the Angels. He had a 0-3 record and, in 42 innings, allowed 23 earned runs -- good for a 4.93 ERA. Through seven games in August, his ERA was 7.71.
The 37-year-old was demoted to Salt Lake on Aug. 19 following the return of right-hander Jordan Walden, who had been sidelined since July 8 with soreness in his neck and a strained right bicep.
Takahashi pitched in 103 games for the Angels during his two-year stint with the club. He went 4-3 with a 3.44 ERA last season and, overall, was 4-6 with a 4.01 ERA.
Manager Mike Scioscia thinks it will be good for Takahashi to get a fresh start in Pittsburgh.
"He struggled with some things, [but] at times he threw the ball well for us in our bullpen," Scioscia said. "He's got versatility, and I think that he'll add a little different dimension to their 'pen."