He is expected to be placed on the seven-day disabled list with bicipital tendinitis, basically a sore right shoulder. The Orioles don't have a timetable for his return but are optimistic the problem is not significant. Klein missed all of his sophomore season at UCLA in 2009 after undergoing exploratory shoulder surgery.
"We want to make sure he is 100 percent before he pitches again," Orioles director of player development John Stockstill said.
Klein, 22, is 3-0 with a 1.08 ERA in nine relief appearances for Double-A Bowie. He was promoted after going 0-1 with a 1.15 ERA in seven outings for Single-A Frederick this season. In 321/3 innings this year, he has surrendered four earned runs, 23 hits, six walks while striking out 37 batters.
Jakubauskas likely to start
Orioles right-hander Alfredo Simon threw three innings in relief Sunday, taking him out of the running for Tuesday's spot start against the Oakland Athletics.
The Orioles have not officially named the starter, but the assignment likely falls to righty Chris Jakubauskas, who threw two innings of relief Friday. Jakubauskas hasn't started since April 24, 2010, when he was with the Pittsburgh Pirates. That start ended with his 12th pitch, when the Houston Astros' Lance Berkman hit a line drive off Jakubauskas' head. He didn't pitch again for the Pirates.
Jakubauskas has been in five games with the Orioles this year, all in relief. He is 0-0 with a 6.39 ERA, allowing 18 hits and six walks in 122/3 innings.
Around the horn
Showalter said infielder Ryan Adams likely would be demoted to Triple-A Norfolk soon to get regular playing time after starting just three games and getting 12 at-bats with the Orioles. The club would likely recall a reserve infielder, but both veterans at Norfolk, Brendan Harris (.216 average) and Nick Green (.195), are struggling offensively. … Andino started his 14th game at second base Sunday. He is filling in for Brian Roberts, who is on the DL with a concussion. … Shortstop Cesar Izturis (elbow surgery) is back in Baltimore and will rehabilitate with the club's athletic trainers before heading to Sarasota, Fla., to continue his rehab when the team leaves for the road next week. He is on the 60-day disabled list but still hopes to play this season. … Shortstop prospect Manny Machado (dislocated kneecap) was officially reinstated to Single-A Delmarva's active roster Sunday and went 1-for-4 with a run. … Infield prospect Jonathan Schoop was promoted from Delmarva to Frederick on Sunday and went 2-for-4 with two RBIs in his debut at High-A. … Mark Reynolds' 128 career homers before getting his first grand slam Saturday night were the most by an active player. … Left-hander Michael Gonzalez, who hadn't pitched since May 27, threw a perfect ninth Sunday. … Lefty Brian Matusz makes his second start of the season Monday and first at Camden Yards this year.