"This whole series, I might play Ruf, while Peter is kind of working on a different approach at the plate," Phillies manager Pete Mackanin said.
Bourjos, who had game-tying and game-winning hits Wednesday against the Mets at Citizens Bank Park, entered the series against the Brewers hitting .191 (9-for-47) with five doubles, three RBIs and a .506 OPS in 15 games.
"We're trying to get him moving to the ball instead of rotating around the ball," Mackanin said. "So we're going to work on that for maybe two or three days, because Ruf can help us offensively. But I can't afford to wait for a lefty, because we haven't seen really many lefties. I'm kind of forcing the issue."
Ruf entered the series hitting .111 (3-for-18) with one double, one RBI and a .317 OPS in 12 games.
Left-hander James Russell cleared waivers and has been outrighted to Triple-A Lehigh Valley. He had an 18.69 ERA in seven appearances with the Phillies.
Todd Zolecki has covered the Phillies since 2003, and for MLB.com since 2009. Read his Phillies blog The Zo Zone, follow him on Twitter and listen to his podcast. This story was not subject to the approval of Major League Baseball or its clubs.