© 2014 MLB Advanced Media, L.P. All rights reserved.

3/29/2014 5:55 P.M. ET

Mejia in rotation; Dice-K 'shocked' by decision

MONTREAL -- In a decision that "shocked" Daisuke Matsuzaka, the Mets on Saturday reassigned the veteran right-hander to Triple-A Las Vegas, adding Jenrry Mejia to their rotation despite multiple questions regarding his health.

Less than 24 hours after X-rays came back negative on Mejia's right forearm, the Mets slotted him in to pitch Friday against the Reds. If Mejia is not healthy enough to make that start, or if Jon Niese is not recovered enough from left elbow soreness to return from the disabled list on April 6, Matsuzaka will immediately slide back into the rotation.

But for now, at least, Matsuzaka is a Minor Leaguer despite his 3.04 ERA and 25 strikeouts in 23 2/3 spring innings, including eight whiffs over five shutout innings Saturday against the Blue Jays. The Mets paid Matsuzaka a $100,000 retention bonus last week, essentially purchasing the right to send him to Triple-A.

"I always knew there was a possibility that I would be going to the Minors," Matsuzaka said through his interpreter. "But I definitely am shocked at this decision."

The decision might have been more surprising had Mejia not also enjoyed a standout spring, striking out 13 batters over 13 1/3 innings with a 2.70 ERA. But Mejia has been dealing with a bunion on his right foot, as well as right forearm inflammation from the Ryan Goins comebacker that struck him in the fifth inning of Friday's exhibition game against the Blue Jays. Still, Mejia said he felt "pretty good" about the Mets' decision to keep him in the rotation.

Mets general manager Sandy Alderson admitted Saturday that Mejia may not be healthy enough to pitch Friday against the Reds, in which case Matsuzaka would be the leading candidate to replace him. But Alderson also indicated that Mejia will not simply be making a spot start as the Mets wait to see if Niese is fully healthy.

To the contrary, manager Terry Collins said he could envision a scenario in which Mejia remains in the rotation until around midseason, at which point the Mets convert him to relief work to limit his innings.

"I think a lot of that will be dictated by how he pitches and how his health is," Collins said. "If he goes out there, there's no reason why we can't get him to 100 innings or so -- not more -- so that takes us pretty deeply into midsummer. By then, if we think his innings are running out, hopefully by then some of those young guys will be ready."

Matsuzaka is not one of those "young guys" by any means. But given the lingering health issues of both Mejia and Niese, there is a reasonable chance he will be back with the Mets before the end of April, if not next week.

"He shouldn't be happy," Collins said. "He'd better not be. I'm sure he feels it was the wrong decision, and I certainly understand it because of the way he threw the baseball. But as I told him, we don't know what's going to happen the next few days. He'd better stay ready, and I know he will."

Mayor de Blasio to throw out first pitch in opener

MONTREAL -- New York City mayor Bill de Blasio will throw out the first pitch Monday during Opening Day ceremonies at Citi Field, the Mets announced.

de Blasio will be accompanied by six children from the East Harlem Tutorial Program who were affected by a recent building collapse in that community. Founded in 1958, the tutorial program runs public charter schools and after-school programs for children in East Harlem.

The Mets also announced that they will celebrate the life and legacy of late broadcaster Ralph Kiner during an on-field pregame ceremony, which will include a video tribute and the unveiling of a Kiner commemorative logo above the left-field wall. Kiner's children, Michael, K.C., Tracee and Kimberlee, will participate.

The Whiptones, a doo-wop a cappella group from Hanover Township, N.J., will perform the national anthem after winning the Mets' Anthem Search competition over the winter. Terence Archie, who stars as Apollo Creed in the Broadway production of "Rocky," will sing "God Bless America" before the seventh-inning stretch.

A select number of standing-room tickets are still available for the 1:10 p.m. ET game against the Nationals. They cost $35 and are available at Mets.com/tickets, (718) 507-TIXX and the Citi Field ticket windows. The Mets expect a sellout and are encouraging fans to take mass transit to the game.

Worth noting

The Mets reassigned reliever Kyle Farnsworth to Triple-A Las Vegas after Saturday's game, ensuring that right-hander Gonzalez Germen will make the Opening Day bullpen. Despite a 7.94 spring ERA, Germen became a favorite to make the team when the Mets sent Vic Black to Minor League camp last week.

Anthony DiComo is a reporter for MLB.com. Follow him on Twitter @AnthonyDicomo. This story was not subject to the approval of Major League Baseball or its clubs.