Castillo was out of the Mets' lineup on Saturday afternoon, a day after leaving Friday night's game early with the injury. Landing awkwardly on his leg after turning a double play in the seventh inning, Castillo left the game moments later under his own power.
Though Castillo said that he felt "better" on Saturday morning, he also confessed that the soreness had increased. The injury is higher on his left leg than the quad strain that forced him to miss time earlier this month, but it's still causing him trouble. So he received treatment, sat out Saturday's game and hoped to be ready to play on Sunday.
"Hopefully it's nothing more than just a little tweak," manager Willie Randolph said.
Castillo has already missed 12 games this season due to a variety of ailments, placing further scrutiny on the four-year, $25-million contract he signed over the winter.
"I want to play every day," Castillo said. "I want to start to get better."
Anthony DiComo is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.