It is not known how much he will be available, if at all, for the three-game series beginning Monday at Shea Stadium, but he is optimistic the injury won't sideline him for very long.
"I woke up Sunday feeling sore," Beltran said. "We'll see about (Monday). To me, it's nothing major."
Beltran was hurt when he nearly collided with Milwaukee first baseman Prince Fielder on a play at the bag.
Beltran said he would be cautious with this injury based on the mistake he made last season with a tight quad.
"Last year, I tried to play through the quad and it didn't work the way I wanted," Beltran said. "I didn't take the time to heal completely."
REPLAY: It wasn't one of Brian Bannister's best games, but it was good enough for him to beat the Brewers 9-3 Sunday at Shea Stadium.
Bannister (2-0) threw 81 pitches through three innings and finished with 112 over five innings, giving up one run on six hits and five walks.
"He had a C-minus game but still made big pitches when he had to," manager Willie Randolph said. "That showed me something."
BY THE NUMBERS: 1 -- The number of times a Mets starter worked less than six innings through their first eight games.
QUOTE TO NOTE: "We're playing with a swagger. We're not cocky, but we're playing with a great deal of confidence. We go to the park believing we're going to win." -- 3B David Wright on the Mets' fast start.
ROSTER REPORT - MEDICAL WATCH
RHP Pedro Martinez's sore right big toe is the key to the season. If he's ineffective, the Mets can kiss their season goodbye.
RHP Victor Zambrano strained his left hamstring and then came down with the flu. He made his season debut April 13.
RHP Juan Padilla is lost for the year with elbow surgery.
2B Kaz Matsui opened the season on the disabled list with a knee injury.
LHP Billy Wagner missed five days at the end of spring training with stiffness in the middle finger of his pitching hand but was healthy by Opening Day.