Swisher was injured on a sixth-inning slide into home plate on Saturday in New York's 5-3 14-inning victory over the Nationals, as Washington catcher Jesus Flores' knee collided with the back of Swisher's left thigh, creating a deep bruise.
"I had a hard time moving yesterday, so I just kind of used [the crutches] to help out," Swisher said. "It's a long walk from this locker room to the bus. It's just tight, man; just feels like it's all knotted up."
Swisher said he planned to spend most of Sunday's game getting treatment from head athletic trainer Steve Donohue. He added that he experienced some nausea immediately after the collision.
"I've never felt something like that," Swisher said. "[Flores] got me good, right in that one spot."
Yankees manager Joe Girardi said that he did not expect Swisher to be available to pinch-hit on Sunday.
"You get a knee to the thigh, you're going to be sore," Girardi said. "He's going to get a lot of treatment, and if we don't get him back tomorrow, we'll shoot for Tuesday. Sometimes those things can linger."