Boone felt a pop in the elbow while he was taking extra batting practice Tuesday.
Doctors believe the bone chip has been in the elbow for some time, but shifted when he swung in batting practice.
``If it was the regular season and I had to play, I could,'' Boone said.
Yesterday, McElroy slightly strained his right hamstring while throwing a pitch in a 6-2 victory over Houston.
McElroy, the only lefthander in the bullpen, said the injury wasn't serious, but the Reds were waiting to see whether the hamstring swelled overnight.
``It's nothing major,'' McElroy said. ``It was just a twinge.''
In other news:
BLUE JAYS: VIOLA REASSIGNED
Former Cy Young award winner Frank Viola, attempting to make the Toronto Blue Jays as a non-roster invitee, was assigned to Double A Knoxville.
Viola has agreed to the assignment.
Viola, one of the game's top pitchers in the late 1980s and early '90s, won the American League Cy Young award in 1988, going 24-7 with Minnesota. He had surgery May 17, 1994, to repair a torn ligament in his left elbow.
Viola, who will be 36 next month, spent most of last season with Cincinnati's Triple A Indianapolis farm team. He was 3-3 with a 4.09 ERA.
METS: ACEVEDO INJURED Juan Acevedo, who worked his way into the New York Mets' pitching rotation, suffered a strained right hamstring during baserunning drills. He will undergo tests, and his status is day to day.
TWINS: AGUILERA HURTING Rick Aguilera has developed tendinitis in the forearm on his throwing arm and is expected to miss his final start of the exhibition season today for the Minnesota Twins.
The injury did not appear to be serious and Aguilera, trying to convert from closer to starter, should be ready for his turn in the rotation against Detroit on Tuesday in the second game of the regular season.
ATHLETICS: ALL BETS OFF State gaming regulators in Nevada have said no dice to those wanting to bet when the Oakland Athletics play their first six regular-season games in Las Vegas.
The Nevada Gaming Control Board reaffirmed an order it issued more than a decade ago preventing any bets on a professional sports team playing in the state.
The A's will play at Cashman Field, a minor league ballpark, while renovations on Oakland Coliseum are being completed.
RED SOX: MITCHELL UPDATE Despite hitting two home runs in Boston's 7-4 loss to Texas, Kevin Mitchell doesn't believe he is ready for the regular season.
Mitchell, who signed late in the spring as a free agent, had been expected to remain in Florida for extended spring training.
``I'm not ready. One day doesn't prove nothing,'' Mitchell said.
Manager Kevin Kennedy said the Red Sox have not yet decided what their plans are for Mitchell.