Phelps pitched for Girardi from 2012-14 with the Yankees. He was 15-14 with a 4.21 ERA in 87 appearances, including 40 starts.

“I’ve said the same thing every single time I’ve been traded midseason: I’m going into a situation where I’m playing meaningful baseball late in the season,” Phelps said. “That’s what we look for. I was introduced to big-league baseball by Joe Girardi. I’m really looking forward to playing for him again. I get to reunite with (former Marlins teammate) J.T. Realmuto, who I had some of my best years of my career with, so there’s a lot to like about the team I’m going to. It does’t hurt any less leaving the guys that I just left, but it’s something to look forward to for sure.”

Overall, Phelps is 34-37 with a 3.83 ERA in 281 career appearances with the Yankees, Marlins, Mariners, Blue Jays, Cubs and Brewers.

“I feel you could put David anywhere,” Girardi said. “He’s added velocity. He knows how to expand up. He’s not just a sinker/slider guy anymore. He has a good curveball, a cutter. He’s been a really effective reliever.”

Philadelphia enters Monday night’s game against Washington with the worst bullpen ERA in the majors at 7.01 — but right in the mix for a spot in the expanded postseason with a 14-15 record.

Phelps had been filling a setup role in the Brewers’ bullpen, which has been the team’s biggest strength thus far.