The Mariners made four roster moves Monday, selecting the contract of veteran left-handed pitcher Arthur Rhodes from AA West Tenn and recalling right-handed knuckleball pitcher R.A. Dickey from AAA Tacoma.

Outfielder Mike Morse has been placed on the 15-day disabled list with a dislocated left shoulder. Left-handed pitcher Eric O'Flaherty has been optioned to AA West Tenn.

Rhodes and Dickey will be in uniform and available for tonight's game vs. the Kansas City Royals.

"With the injuries we've had our pitching is a little beat up," Mariners manager John McLaren said.

"Going to 12 pitchers will allow us some more protection while we battle through this stretch. Both Arthur and R.A. were very good this spring, and have thrown the ball well in the minors, and we think giving Eric some time to straighten himself out will benefit him, and us, this season."

Rhodes, 38, spent nearly two weeks in Peoria, Arizona at the Mariners extended spring training, before joining AA West Tenn this week. In one appearance with the Diamond Jaxx, he allowed 1 ER in 0.1 IP. Rhodes was 0-0, 1.93 in 5 spring training games this year.

He missed all of the 2007 season recovering from "Tommy John" surgery on his left elbow. The surgery was performed May 2, 2007 by Dr. Lewis Yocum.

Rhodes has a career mark of 75-60, 4.31 in 653 big league games (61 starts) with Baltimore (1991-99), Seattle (2000-03, 2007), Oakland (2004), Cleveland (2005) and Philadelphia (2006). He is 26-15, 3.07 in 276 career appearances with the Mariners.

Dickey, 33, has made two starts with AAA Tacoma, compiling a 1-1, 2.40 mark. In 15.0 innings pitched, he's allowed just 4 earned runs and struck out 11 while walking only 1. Opponents are hitting just .182 against him.

Dickey, the PCL Pitcher of the Year in 2007, has a career mark of 16-19, 5.72 in 77 games (33 starts) with the Texas Rangers (2001-06). He has appeared in just one Major League game (his only appearance in 2006) since converting fulltime to the knuckleball.

Morse, 26, left Sunday's game after landing awkwardly on his left shoulder on a diving attempt to catch a fly ball in right field. An MRI revealed that he dislocated the shoulder. In five games this season, Morse was hitting .222 (2x9) with 1 double. He set a Mariners record by hitting .492 this spring.

O'Flaherty, 23, appeared in seven of Seattle's first 13 games this season, but allowed runs in 6 of them. He is 0-1, 20.25 after allowing 15 earned runs in 6.2 innings.