An industry source said Saturday that doctors are trying to determine whether Ellsbury has a deep bone bruise or fracture in his right foot, the result of fouling a ball off his foot Aug. 28 in a game at Fenway Park.
Ellsbury aggravated the injury Thursday night when he stole second base in the 10th inning of Boston's 9-8 win over the New York Yankees and did not respond to treatment Friday, according to manager John Farrell.
Ellsbury returned to Boston and underwent an examination and MRI Saturday morning and was scheduled for additional testing, Farrell said. He also is scheduled to go to Denver to see Dr. Thomas Clanton of the Steadman Clinic for a second opinion.
"I don't think we're looking at something that is just day to day here," Farrell said Saturday.
The injury involves the navicular bone, the same bone that Red Sox second baseman Dustin Pedroia fractured in his left foot with a foul ball in San Francisco in 2010. Pedroia was placed on the disabled list the next day, June 26, returned to play two games in August before returning to the DL for the rest of the season. He had surgery in the offseason in which a screw was inserted to promote healing.
The Red Sox recalled rookie Jackie Bradley Jr. from Triple-A Pawtucket and will start him in center field for Saturday's game against the Yankees.
Ellsbury, who leads the majors with 52 stolen bases, was batting .299 with a .355 on-base percentage. The speedster was batting .320 (24 for 75) in his last 17 games, with eight stolen bases in that span.