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"I guess the stress CT, which has to be done about a week after the injury, is the best way to get a definitive answer on if it's anything more than what we think it is," Ausmus said after the Tigers' 5-1 win over the Mets on Monday.
At that point, they expect to receive a definitive timetable on how long he'll need to return.
Martinez sustained the injury Saturday against the Marlins at Publix Field at Joker Marchant Stadium. X-rays taken immediately afterward showed no structural damage, but Martinez underwent an MRI exam Sunday morning to get a further look.
Team doctors reviewed the MRI results Sunday, but they wanted a specialist to do so, as well. That led to speculation that something showed up on the exam that requires additional expertise.
"Actually, it was kind of the opposite," Ausmus said Monday morning. "We just want to make sure that it's not anything. We don't want to miss anything, so send it to someone who's got more experience in the area."
Ausmus added that Martinez came into the clubhouse Monday morning feeling better than he did on Sunday, which provided additional encouragement. The stress CT essentially puts Martinez's spring on hold, but Ausmus said he remains upbeat about Martinez's situation.
"My optimism has not changed," Ausmus said.
To this point, Ausmus said the Tigers haven't discussed how they would fill right field if Martinez isn't ready for Opening Day.
"We have enough outfielders here that we can fill the gap," Ausmus said.
• Miguel Cabrera returned from the World Baseball Classic and spent Monday receiving treatment on his tight back, which kept him out of Venezuela's finale. He'll have Tuesday off with the rest of the team and will miss Wednesday's game against the Blue Jays.
"We'll see how he is after that, kind of play it day to day," Ausmus said.
• Tyler Collins, who was scratched from Sunday's game with tightness in the middle of his back, did not play Monday but took part in morning workouts. He'll likely miss Wednesday as well and is considered day to day.
• Omar Infante was scratched from Monday's game after his back tightened up during batting practice. He's considered day to day, and he is not expected to play against the Blue Jays on Wednesday.
• The Tigers added reliever Arcenio Leon to big league camp as a non-roster invitee. He had been pitching in their games as a callup from Minor League camp before spending last week pitching for Team Venezuela in the World Baseball Classic.
• The Tigers optioned right-hander Sandy Baez to Class A Advanced Lakeland and Warwick Saupold to Triple-A Toledo, while assigning A.J. Achter, William Cuevas and Dustin Molleken to Minor League camp. The team also reassigned infielder Brett Pill, but he is evaluating his options.