New York Yankees pitcher Michael Pineda and outfielder Jacoby Ellsbury are considered day to day after suffering recent injuries.
The Yankees also announced Tuesday that right-hander Ivan Nova had Tommy John surgery to repair the ulnar collateral ligament in his right elbow.
Ellsbury is out with a sore hand, although tests showed no structural damage.
Girardi hopes that Ellsbury will be available to return for Wednesday's game. Brett Gardner will take over in centre field until Ellsbury returns.
Pineda is dealing with a lat injury that apparently happened while pitching a simulated game in Florida. The team sent him for an MRI to determine the severity of the injury.
Pineda is serving a 10-game suspension for using pine tar during a game against the Boston Red Sox.
Nova suffered his injury during Saturday's game against the Tampa Bay Rays and was placed on the disabled list the following day.
An MRI confirmed the initial diagnosis of a partial tear of Nova's right ulnar collateral ligament.
The right-hander will miss the remainder of the 2014 season.
BRAUN OUT INDEFINITELY
Milwaukee Brewers outfielder Ryan Braun was diagnosed with a strained oblique and is out indefinitely.
The Brewers discovered the strain, initially thought to be a chest or intercostal injury, during an MRI exam Monday.
Braun left Saturday's game because of the injury and was out of the lineup Sunday and Monday.
Brewers manager Ron Roenicke projected Braun could miss 3-5 games, but the team will evaluate Braun during the three-game series in St. Louis before determining his timetable for return. A stint on the disabled list has not been ruled out.
"I get treatment twice a day and hope for the best and see what happens. That's all you can do with these things," Braun said. "I'll get treatment as much as I can and do what we can to make it better."
Braun is hitting .318 with six home runs this season. Elian Herrera started in right field for Braun on Monday. Roenicke said he would continue to start in Braun's absence.
CHAPMAN HEADING FOR REHAB
Cincinnati Reds Aroldis Chapman pitched another live batting practice session Tuesday afternoon and appears to be headed to the minor leagues on a rehab assignment as he continues his recovery from taking a line drive to the face during spring training last month.
Chapman's simulated game session in Cincinnati before the Reds played the Chicago Cubs included 25 pitches, MLB.com reported, and he reached 98 mph with his fastball.
The Reds closer could begin his rehab stint as early as Thursday at nearby Class A Dayton. He expects to pitch four to five minor league games before returning to the Reds.
Chapman suffered facial fractures when he was struck in the face by a batted ball in an exhibition game March 19. He underwent surgery to insert a plate to promote healing.
ELBOW SURGERY FOR GRIFFIN?
Oakland Athletics pitcher A.J. Griffin is facing Tommy John surgery, according to CBS Sports.
Griffin has not pitched since spring training and the team has yet to acknowledge that the young pitcher will need the surgery. If the right-hander does undergo the procedure, Griffin will be out until early next season.
The 26-year-old posted a 14-10 record with a 3.83 ERA and 171 strikeouts while pitching 200 innings last year for the Athletics, who won the American League West championship.
Fellow Athletics pitcher Jarrod Parker had his second career Tommy John surgery this year.
MACHADO READY TO RETURN
The Baltimore Orioles are ready to activate third baseman Manny Machado.
Machado, 21, injured his left knee running to first base in a game last September and had surgery in the offseason.
He played three minor league games in a short rehab assignment and was 8 for 12 with four doubles and a triple.
Machado led the the majors in doubles with 51 last season and won a Gold Glove Award.