Galloway got just 100 at-bats for high Class A Jupiter before a nasty outfield collision ended his season. The resulting kidney damage landed Galloway in the hospital for the better part of a week.
"It was bad," vice president of scouting and player development Jim Fleming said. "It took a lot out of him. We sent him home for almost a month and a half because he really couldn't do anything."
Doctors pronounced Galloway healthy and cleared him for baseball activity in August, but he won't play competitively again until next season. The 6-foot-2, 190-pounder lost about 15 pounds of muscle as he recuperated.
The priority for Galloway is regaining strength this offseason. His baseball activity has included taking 25 to 30 swings a day, catching fly balls and some throwing.
"The swing is fine," Fleming said. "He still has bat speed. We just need to get him strong so he can get through spring training and the season . . . This really puts us behind. We'll just go slowly with him. He's still a young kid. We don't want to rush here."
Galloway, a 2008 eighth-round pick out of high school in California, will be 21 when next season starts, and he'll probably open with the Hammerheads again and try to get off to a better start. When Galloway went on the disabled list he was batting .200/.259/.290 with no homers. He struck out 21 percent of the time, down from 26.2 percent in 340 at-bats with Greensboro in 2009.
Defensively, the Marlins made mechanical adjustments to improve Galloway's throwing, and that work continues. Fleming believes Galloway will develop an average arm from center.
"It had gotten better. (The injury) has been a real setback for him, but he's been healthy and there are no after-effects," Fleming said.
• The Marlins extended their player-development contracts with Triple-A New Orleans, Double-A Jacksonville and Greensboro through the 2013 season.
• Greensboro catcher Kyle Skipworth returned action in mid-August after missing three weeks with a wrist injury.