Castillo will spend Monday's off-day undergoing an examination on the foot, and he could land on the disabled list pending the results.
"Maybe DL," Castillo said. "I dont know."
Castillo has been wearing an orthopedic pad in his left shoe for roughly two weeks, and he had his foot wrapped prior to Saturday's game against the Yankees. He has endured varying degrees of pain since Spring Training, and Mets manager Jerry Manuel recently indicated that Castillo may soon need an extended period of rest. A trip to the disabled list would provide that.
"It's sore today, man," Castillo said late Sunday night. "It's killing me."
Alex Cora, who replaced Castillo in Sunday's lineup and hit a two-run single, said he is prepared to take over at second base if needed.
"That's what I do is prepare myself," Cora said, "and come here thinking I'm going to play every day."