Keselowski is moving full time to the No. 12 car next season, but team owner Roger Penske wants Keselowski to get some seat time in the car now in preparation for the 2010 season, starting with the Dickies 500 Sunday at Texas Motor Speedway.
"These three races will provide a good base for both Brad and the team as we head into next year," Roger Penske said in a team release Monday. "Penske Racing also thanks David Stremme for his contributions to the team and we wish David the very best moving forward."
Keselowski, 25 and a native of Rochester, Mich., has competed in 12 Cup races this season, posting four top-10s. He earned his first Cup victory in the April race at Talladega.
"We all have high expectations for next season and beyond," Keselowski stated in the release. "Being able to race with the team this year will only help us as we look toward 2010."
Keselowski ranks third in the Nationwide Series standings this season, driving the No. 88 Chevy for JR Motorsports. He is the highest ranking Nationwide driver who isn't a full-time Cup competitor.
Stremme ranks 31st in the Cup standings, failing to post a top 10 in 33 races this season.
Terry Blount covers motorsports for ESPN.com.