Los Angeles manager Mike Scioscia is hopeful Weaver will be able to start tonight's game at Boston.
"If this was the seventh game of the World Series, I think you'd see him out there trying to pitch," Scioscia said. "He had some IVs put in, and I think one more day of getting fluids in him and he should be good to go."
Weaver is 6-0 with an 0.99 ERA in six starts this season. He has been ill for a couple of days.
TIGERS: Victor Martinez is getting closer to returning to Detroit's lineup.
The veteran catcher-designated hitter, on the disabled list with a strained right groin since April 19, is scheduled to start a rehab assignment today with Triple-A Toledo.
The switch-hitter was signed as a free agent in November to a four-year, $50 million contract. He hit .250 with two homers and nine RBI in 16 games before being hurt.
YANKEES: Veteran right-hander Kevin Millwood opted out of his contract with New York, which he could do if he wasn't called up from the minors by May 1.
The 36-year-old former Atlanta Brave agreed to a minor league deal with the Yankees in late March but has been stuck there as Freddy Garcia and Bartolo Colon locked down the back end of the rotation. He was 4-16 with a 5.10 ERA for the Baltimore Orioles last season.