He played in three rehab games with Class A Advanced Fort Myers but retriggered concussion-like symptoms while diving for a ball on June 22. He's expected to begin a new rehab assignment as soon as he's declared ready by team doctors.
"He's going through tests again," general manager Terry Ryan said. "He jarred his head when he dove for a ball and got dizzy. We wanted to wait a few extra days, because you don't want a guy to go on an airplane after that. So we got through that, and he got yesterday, and now we'll go through the same process again."
Rhett Bollinger is a reporter for MLB.com. Read his blog, Bollinger Beat, and follow him on Twitter @RhettBollinger. This story was not subject to the approval of Major League Baseball or its clubs.