Mets general manager Omar Minaya said the lefty's absence wasn't related to a medical condition.
Glavine is set to start Tuesday against Houston.
Glavine, who turns 41 later this month, went 15-7 last season. He missed two weeks in late August because of a blood clot in his left shoulder - doctors said it was the result of scar tissue from an old injury and not serious.
The two-time NL Cy Young winner starts the season with 290 career victories.
GIANTS: Barry Bonds missed spring training workouts for the second day in a row because of the flu.
Bonds wasn't in the Giants' lineup for a home exhibition game against the Seattle Mariners after coming down with the same bug that has affected much of the Giants' roster in the past two weeks.
The seven-time NL MVP went 0-for-2 in his spring debut last Friday but won't play again until at least Tuesday. The Giants travel to face the Arizona Diamondbacks in Tucson today, and Bonds rarely makes any road trip, let alone the longest in the Cactus League.
Bonds has 734 homers entering the season, 22 shy of breaking Hank Aaron's major league record.
ROYALS: Second baseman Mark Grudzielanek will have arthroscopic surgery on his left knee today and is expected to be out at least a month.
Grudzielanek has a medial meniscus cartilage tear. He first experienced knee pain Friday night and reported it to the training staff Saturday.
Grudzielanek will have surgery in Kansas City. Once he is cleared to travel, he will return to spring training camp in Surprise, Fla., to begin rehabilitation, the Royals said.
In a statement, the team said there is no timetable for Grudzielanek's return. The 36-year-old Grudzielanek hit .297 and won his first Gold Glove award last season, his first with the Royals.
ATHLETICS: Shortstop Bobby Crosby faced live pitching for the first time this spring and showed no lingering effects from the back injury that sidelined him for the final two months last season.
"It's been a long time to wait but it was good," said Crosby, the 2004 AL Rookie of the Year. "I was antsy coming into spring but I didn't want to rush it. When you rush it, you hurt it."
ANGELS: Vladimir Guerrero says his knees are fine and he won't have surgery.
"My mom's side of the family, we have a leg longer than the other, and sometimes it looks like I'm hobbling, but it's not," the Los Angeles Angels star said through a translator Saturday.
Guerrero had an aching right knee last season. He said doctors recommended an operation, but the knee felt good before spring training and he opted not to have surgery. Guerrero hit .329 with 33 homers and 116 RBI in 2006.