"It feels like the worst charley horse ever," said Swisher, who left the clubhouse on crutches Saturday night and limped noticeably Sunday morning. "It's just tight, man. Just feels like it's all knotted up."
Swisher was injured in the sixth inning of Saturday's 14-inning, 5-3 Yankees victory over the Washington Nationals when his left thigh collided with the knee of Nationals catcher Jesus Flores as he tried to score on Eric Chavez's double.
Swisher left the game and was replaced by Andruw Jones in right field. Jones played in Swisher's place during Sunday afternoon's series finale, going 0-for-3 with two walks in the Yankees' 4-1 victory.
Swisher said he did not think the injury would land him on the disabled list, and held out hope that he might be able to play Monday night against the Atlanta Braves in New York.
But manager Joe Girardi seemed to be preparing to not have Swisher in his lineup for a couple of days at least.
"He's 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."
Swisher is batting .262 with 10 home runs and a team-high 40 RBIs this season. Saturday, he got on base all three times he came to bat, with a double, single and a walk.
"It feels way better today than yesterday," he said. "It's just one of those deep things, and we've got to get all the soreness out. I hope to get back in there tomorrow."