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04/28/11 6:02 PM ET

White to make big league debut Saturday

CLEVELAND -- Manny Acta considered breaking the news on Twitter. Instead, the Indians manager stuck with the regular routine when announcing who would take the mound for the Tribe on Saturday.

"I was going to tweet it," a smiling Acta told reporters on Thursday afternoon. "But I'm going to give it to you guys. We're going to bring up Alex White to make his Major League debut on Saturday."

The move had been speculated, but now it is official. White -- Cleveland's top pitching prospect -- will be summoned from Triple-A Columbus prior to Saturday's home game against the Tigers. As of right now, it appears as though White will make at least two starts for the Indians.

White, who was the 15th overall pick in the the 2009 First-Year Player Draft, will take Carlos Carrasco's spot in the Tribe's rotation. Carrasco (right elbow inflammation) was placed on the 15-day disabled list on Thursday and is not eligible to be activated until May 10.

The Indians felt White gave the team the best chance to continue their strong start to this season.

"He's thrown the ball very well," Acta said. "We've gotten some good reports on him. At the end of the day, we tell every single one of these guys when they go down there, 'Make sure that when we need a guy, make it be you.' He worked himself into that spot."

Through four outings with Triple-A Columbus, the 22-year-old White went 1-0 with a 1.90, amassing 28 strikeouts against five walks over 23 2/3 innings. White is not on the Indians' 40-man roster, so a subsequent transaction will be required in order to add him to the big league rotation.

The Indians promoted reliever Frank Herrmann from Triple-A on Thursday to take Carrasco's spot on the roster. That gives Cleveland an extra bullpen arm over the next two games. Before calling up White, the Indians will need to demote a reliever in advance of Saturday's game.

"We don't know how long he's going to be here," Acta said of Herrmann. "We're going to have to make a move obviously on Saturday to add [White]. We had to put Carlos on the DL and we brought in an extra arm."

Acta said the Indians did not let White's lack of professional experience affect the team's decision. Last year, which was his first in the Tribe's system, White went 10-10 with a 2.45 ERA between stops with Class A Kinston and Double-A Akron. Before signing with Cleveland, White pitched at the University of North Carolina.

"He's a polished college guy," Acta said. "This is not a high school or junior college guy. He's a big-time college pitcher. He has met just about every one of the expectations we set out for him, including last year moving him from high A to Double-A.

"He's pitching well. He's throwing the ball the best down there and gives us the best chance to win the ballgame on Saturday."

Jordan Bastian is a reporter for MLB.com. Read his blog, Major League Bastian, and follow him on Twitter @MLBastian. This story was not subject to the approval of Major League Baseball or its clubs.