The Associated Press reported earlier in the week that the deal is worth $18 million.
Sipp, 32, was a key late-inning reliever for the Astros last season, with a career-best 1.99 ERA in 60 appearances, striking out 62 batters in 54 1/3 innings. He did not allow a run in six postseason appearances, allowing just one hit. He has held opponents to a .184 average over the past two seasons with Houston.
- Jeremy Woo