The two-time All-Star said he felt a little tightness after Sunday's game against Pittsburgh and had a precautionary MRI on Monday night.
"We're checking it today to see what I have," Encarnacion said Tuesday. "It's something I want to make sure it's right. ... I want to do that before I continue my work."
Manager John Gibbons expects the first baseman-designated hitter to return to the lineup in about a week.
"It's just irritation, you know, a lot of swings early in camp," Gibbons said. "There's no damage in there."
Encarnacion hit .268 with 34 homers and 98 RBIs in 128 games last season, hindered by a right quadriceps injury throughout the second half. He is hitless in six plate appearances in spring training.