John Jaso's season in jeopardy
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OAKLAND -- Concussed catcher John Jaso's season is in jeopardy of being over.

"Whether or not he comes back this year," said A's manager Bob Melvin, "we're not sure. We're hopeful.

"It's a pretty dangerous situation…we'll take it pretty slow."

Jaso, who was initially placed on the 7-day disabled list with the concussion on July 25 and then transferred to the 15-day D.L., was injured after taking foul tips off the mask at Houston on July 24. He visited concussion specialist Dr. Michael Collins in Pittsburgh on Tuesday.

After a day of tests, Collins told Jaso he had good news and bad news.

"He said it would be very unwise to play with me still being symptomatic," Jaso said Friday. "My brain is still injured."

The good news?

"I will be back 100 percent," Jaso said. "The question just is, when?"

Jaso, who also suffered concussions in 2005 and 2010, said Collins told him to return to the field in three weeks from his visit would be "generous" and that it could be "months" before he plays in a game again. Until then, Jaso is working on visual stimulation exercises that, he joked, "might even make me a better hitter."

In Pittsburgh, Jaso said he performed card exercises and was fine, until he did "up-down" motions.

"It was like car sickness at its worst," said Jaso, who added that he had to sit near a toilet for fear of vomiting for 20 minutes.

Jaso said he was feeling better during the A's last road trip and attempted to play catch at the Coliseum. But his eyes focusing on the ball made him feel ill again. A sense of vertigo came over him in the press box.

"I really want to rush back," Jaso said. "The doctor told me that was not wise.

"I just have to keep my body physically ready."

There are six-plus weeks remaining in the season, but the A's are more worried about his well-being.

"He will recover fully," Melvin said. "That's the important thing, the first thing that makes you feel better."