Boston shortstop Nomar Garciaparra was taken to a hospital for X-rays Friday night after injuring his shoulder during a 14-3 victory over Kansas City.
Manager Jimy Williams said it was a "slight strain of the right shoulder."
Garciaparra, the American League's rookie of the year last season, got up and walked off the field after falling on the shoulder in the seventh inning.
"It was a slight sprain. That's all I know," said Williams. "We probably won't know anything until tomorrow. He went to get checked out by the doctor."
As expected, first baseman Hal Morris, second in the league with a .395 average, was put on the 15-day disabled list and the Kansas City Royals recalled outfielder Jermaine Dye from a triple-A rehabilitation assignment.
Morris pulled his hamstring Thursday night while running to first during the Royals' 5-3 victory over Boston.
New York Yankee right-hander David Cone, who left Tuesday's 7-2 win at Texas after five innings due to a mild strain in his left knee, will miss his next scheduled start Sunday at Minnesota. An MRI taken Thursday in New York revealed the strain.
Cone's next start was pushed back to Tuesday against the Kansas City Royals at Yankee Stadium.
Baltimore's Brady Anderson, sidelined since April 20 because of a sprained left shoulder joint, was activated from the 15-day disabled list. The Orioles opened a spot on the roster by putting left-handed pitcher Doug Johns on the disabled list because of insomnia.