Texas Rangers pitcher Yu Darvish is probably finished for this season because of an elbow injury.

That's what Rangers general manager Jon Daniels said during a radio interview on Monday, according to the Dallas Morning News.

Darvish was placed on the 15-day disabled list on Aug. 13 because of elbow inflammation, but there seems to be little chance that the Rangers will have him pitch again this season.

"By the calendar and how close to the end of the season we are, I don't know that it will allow him to pitch again," Daniels said on KRLD-FM, according to the Morning News. "I think it's critical going into next year for us to put all these injury issues and concerns behind us as we possibly can. It doesn't seem to make a whole lot of sense to me to take a risk when the MRI clearly shows there is something going on in there."

Darvish is 10-7 with a 3.06 ERA this season. He last pitched on Aug. 9, when he allowed nine hits, four walks and six runs (five earned) in just four innings against the Houston Astros.

---The Pittsburgh Pirates sent outfielder Gregory Polanco to Triple-A Indianapolis.

Polanco, 22, is widely considered one of the top prospects in Major League Baseball.

Polanco has a batting line of .241/.308/.349 with nine doubles, six home runs and 12 stolen bases in 64 games since being called up in June. He only has one hit in his last 30 at-bats.

The Pirates recalled outfielder Jose Tabata from Triple-A and activated shortstop Clint Barmes off the 15-day disabled list. The team also designated infielder Jayson Nix for assignment.

---Kansas City Royals first baseman Eric Hosmer, who went on the disabled list Aug. 1 with a fractured right hand, was given clearance to take dry swings after being given a CT scan. If he has no setbacks, Hosmer hopes to begin a minor league rehab assignment next week.

---New York Yankees minor league right-handed pitcher Andy Beresford and minor league first baseman Leonard Thompson received 50-game suspensions for violations of the drug policy.

The Office of the Commissioner of Baseball said that the players tested positive for an amphetamine and were suspended as part of the Minor League Drug Prevention and Treatment Program.

Beresford is currently on the roster of Class A Charleston of the South Atlantic League. Thompson is on the roster of the rookie-level Gulf Coast League Yankees.

---Philadelphia Phillies right-hander Mike Adams, on the disabled list since June 7 with an inflamed right rotator cuff, will begin a rehab assignment Tuesday at Triple-A Lehigh Valley. Manager Ryne Sandberg said the plan is for Adams to pitch three times over seven or eight days, then reevaluate him.

---St. Louis Cardinals catcher Yadier Molina (torn ligament in left thumb) will begin working out with Double-A Springfield on Tuesday and right-hander Michael Wacha (stress reaction in right scapula) will join him Wednesday.

The plan is for Molina to play in a rehab game Wednesday while Wacha pitches live batting practice before the game.

Left-hander Tyler Lyons was recalled from Triple-A Louisville and infielder Greg Garcia optioned to Springfield, providing the Cardinals with an extra reliever after the bullpen pitched 11 innings in the previous two games.

---Houston Astros right-hander Brad Peacock completed a throwing session without complication and remains on schedule to make his next start Wednesday against Oakland. Peacock was removed from his previous outing on Aug. 22 at Cleveland after five innings with right forearm discomfort.

---Oakland Athletics catcher John Jaso was officially placed on the seven-day disabled list retroactive to Sunday with a concussion. Catcher Geovany Soto, acquired on Sunday from the Texas Rangers, replaced Jaso on the active roster.

---Baltimore Orioles third baseman Manny Machado will be leaving the team to have surgery on his right knee Wednesday in Los Angeles. He hopes to be back with the team if it locks up the division title, but it's possible he wouldn't be back until the playoffs.