"He had some tendonitis in his shoulder," Pirates Manager John Russell explained. "It's been a little achy the last couple of weeks. We're going to err on the side of caution. We don't want it to linger. With the time off, he should get some much-needed strength back in there."
Dumatrait's next scheduled start had been Wednesday against the New York Yankees. Zach Duke, who had been set for Thursday, could be pushed up a day because of the day off tomorrow. It is unclear what would happen beyond that.
"We need a starter on Saturday," Russell said. "That gives us six days to make a decision. Neal Huntington and I will talk and see what to do for Saturday. Phil can come back on the fifth in Milwaukee. It might have affected him in Chicago. Also, I'm sure mentally it was in the back of mind. We need to get his shoulder back to where it needs to be. The condition hadn't shows up before."
In 26 Triple-A relief appearances this season, Beam turned in a 2-1 record, 2.03 ERA, four saves, 39 strikeouts and .201 batting average against.
Beam recorded a 1.19 ERA (3 ER in 22.2 IP) over his last 16 relief appearances. He also strung together seven consecutive scoreless outings (12.1 IP) from May 2-23.
Beam, who has 64 days of Major League service time, made 20 relief appearances for the New York Yankees in 2006. He owns a 2-0 record and 8.50 ERA in 18.0 big league innings.
The 27-year-old went 4-3 with a 3.59 ERA in 29 relief outings for Triple-A Scranton/Wilkes-Barre (Pa.) a season ago. He signed with the Pirates as a Minor League free agent on Dec. 22, 2007.
On Thursday, RHP Jonah Bayliss (0-3, 6.00) was traded to the Toronto Blue Jays organization and OF Kevin Thompson (.282, 4, 18) was placed on the DL. RHP Chris Hernandez (0-0, 7.04) and INF Luis Ordaz (.414, 1, 7) were also activated from the DL.
Pittsburgh will need to make a roster move, the 40-man roster currently is full, a player will have to be removed or placed on the 60-day disabled list. The only player on the 15-day disabled list is center fielder Chris Duffy, now on a rehabilitation stint with Class AA Altoona.