Twins center fielder Denard Span returned to the 15-day disabled list Thursday with migraine symptoms, making it uncertain when or if he'll return this season.
Span suffered a concussion June 3 and missed 48 games on his previous trip to the DL, but head trainer Rick McWane said Span's symptoms now are more similar to the vertigo and dizziness he began experiencing in 2009.
"It's not concussion symptoms," McWane said. "The concussion stirred up a previous existing condition. These are migraines that present themselves not as a headaches but as dizziness and vertigo."
Span was batting .300 when he suffered his concussion. After returning from the DL on Aug. 2, he batted .057 (2-for-35) in his next nine games.
"My first two or three games in Anaheim, I felt fine, and all of a sudden some of these symptoms started coming back a little bit," Span said. "It's not as bad as two months ago, but it's still bothering me. I don't think it's smart to be on the field. I'm not helping myself and definitely not helping my team."
Span, 27, continues to consult with a concussion specialist in Pittsburgh. He tried taking medication but stopped because it wasn't helping.
"I wouldn't say I feel foggy and dizzy 24/7; it just kind of comes and goes," he said. "Once I do get going, I feel fine, but it's just been tougher to get going."
For now, the focus is on getting Span healthy, if not for the end of this season, then for 2012.