Aaron Hill might be ready to rejoin the Toronto Blue Jays sometime next week. Then again, he might not.

There are no firm timetables when a player suffers a concussion, something the young second baseman has been learning the hard way. Hill hasn't played since taking teammate David Eckstein's elbow in the cheek as both chased a pop fly May 29, and every day that's followed has been a question mark.

"This is so annoying, frustrating," said Hill. "If it was something else, it's easy to grind through an ankle or a knee, hip, arm, whatever, you can fight through that stuff. They've got painkillers for those types of things. But doing something with the brain, you don't want to mess with it.

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"I would, but way too many people have told me I shouldn't, and I'm listening for a change."

The 26-year-old is on the disabled list for the first time in his four big-league seasons and is eligible to be activated Saturday. His return would be a big boost to the struggling Blue Jays, who'll take a 34-34 record and a poor 2-4 mark on their nine-game homestand into Friday's series opener with the NL-Central leading Chicago Cubs.

It's not going to happen.

Right now, the team is simply hoping Hill remains symptom-free through Monday, which would mark seven normal days and allow him to start a rehabilitation assignment. If he has a setback, the cycle must start again.

"I don't understand it because I've never had it before," said Hill. "I want to just play the game but people are saying, 'What if this happens, what if that happens?' I know you've got to play it safe but my whole life, you just go play, and having a brain injury, you just can't do that.

"Right now, if I ran to first at 100 per cent I don't know if I'd have my wits about me."

While concussions are uncommon in baseball, there are enough cautionary tales out there to help convince a reluctant Hill to be patient.

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The New York Mets, for instance, placed outfielder Ryan Church on the disabled list Tuesday after he suffered repeated setbacks since injuring his head May 20.

It was his second concussion in three months, but Church pinch-hit just two days later and made a few more appearances off the bench in subsequent days before making four starts over the past week.

Church then sat out over the weekend because of what he described as "a heartbeat in my head." The trip to the DL followed.

Canadian Corey Koskie and Mike Matheny both had their careers cut short by the cumulative effects of multiple concussions.

"Concussions are one of the toughest injuries in sports, in life to deal with," said Blue Jays trainer George Poulis. "They're really unpredictable, they can be labelled mild and people can then have symptoms, you upgrade them to more severe concussions.

"There's nothing clear-cut about (dealing with) them, not every one is the same."

Hill's injury was initially thought to be a mild one but it was eventually upgraded to a Grade 2 concussion, which could leave him more susceptible to future head injuries.

He's battled headaches, dizziness, grogginess and had his head alternate between feeling heavy and light. He think this is his first one, but isn't 100 per cent sure.

"Who knows, I might have had one in football getting my head wrung but I've never been to the hospital before (for his head)," he said. "I've never had anything close to these symptoms, the constant headaches and light-headedness."

Shutting it down hasn't been easy for one of the more energetic players on the Blue Jays, who is always up for some early batting practice or an extra round of grounders.

His work now is watched closely, with levels of exertion monitored carefully.

"The more strenuous activity I go through the more the headaches come in. (Monday) it came back a little bit," Hill said. "I have real good days but if I do too much then it comes back, so that's when I know it's still there."

That's why until he gets the green light, all Hill can do is cheer on his teammates from the dugout and take his limited amount of swings and grounders. To do otherwise would be foolish.

"That's tough because I can't stand not being out on the field, I can't sit still, so I'm going back and forth from the locker-room to the bench every five minutes," he said. "Just taking it slow. It is what it is."