Bour, 30, hits .227 this season with 19 home runs and 54 RBIs in 112 games with the Marlins. He has a career .262 / .346 / .470 slash over parts of five seasons with the Marlins.
"I imagine he's a dynamic, powerful weapon from the bank," said Phillies manager Gabe Kapler.
"The numbers against righties are outrageously good and the disc discipline fits our lineup well, he knows how to look over baseball, he attacks him when he's in the zone, he fucks balls, he fights, he's tough in action. " "Said Kapler.
The Phillies have requested a waiver of Bour before trading with the Marlins. Miami also sent $ 466,129 to Philadelphia to cover half of Bour's remaining salary this season, in return for a better prospect for the deal, a source told ESPN.
Bour has four years of MLB service time and earns $ 3.4 million this year. He has two years of salary arbitration and was a candidate who did not compete in Miami this off-season.
The thrusting Carlos Santana has started 112 of Philadelphia's first 114 games on first base this season so Bour will be primarily a bank for the Phillies to win a postseason.
Philadelphia started Friday night in San Diego with three games, one game ahead of Atlanta and six games ahead of Washington.
"I think it's worth noting that he's really hurting the Braves, I think that's important," Kapler said. "And look, he's going to crack down on a right-handed or a starter, and we'll look for ways to use him opportunistically."
The Marlins are likely to use Derek Dietrich and Miguel Rojas as first base in the last two months of the season. Garrett Cooper is also recovering from a wrist injury that has twice put him on the disabled list this season.
Mills has spent the season in Single-A Advanced Clearwater.
This report uses information from The Associated Press.
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