Hannahan said he started experiencing the tightness midway through the Indians' 12-1 loss to the Red Sox on Sunday. Later that night, the pain became progressively worse during the team's flight to Minneapolis, leading to his absence from the lineup in the first game of the two-game set against the Twins.
The tightness has subsided slightly, Hannahan said, but his status remains day to day. He will wait at least another day before attempting to take swings in the batting cage.
Indians manager Manny Acta wouldn't put a timetable on Hannahan's return, though there is reason to be optimistic that the 32-year-old infielder will be available when the team returns to Cleveland on Wednesday for a two-game series against Seattle.
"He's improved some. We'll see how the flight back home will affect him and reevaluate him tomorrow," Acta said.
The injury put a damper on Hannahan's homecoming. A St. Paul, Minn., native, Hannahan attended the University of Minnesota and was a stalwart for the school's baseball team, earning Big Ten Player of the Year honors in 2000.
"I'm disappointed I can't play, let alone in my hometown with my friends and family," Hannahan said. "But it's baseball. I'll try to get back out there as soon as possible."
Hannahan has posted a .287 batting average in 30 games this season, with six doubles and a trio of home runs.