"We've gotten enough back to know it's the right decision," Matheny told The Associated Press on Tuesday. "These games wear me out. They wear me out on TV. I get foggy."
And so does even the lightest of physical activity, such as household chores. The Giants thought Matheny might have only inner-ear damage, but tests quickly showed it was a more severe problem.
"This does not mean his career is over," trainer Stan Conte said. "It means we need more time for the symptoms to subside. Every time we have tried to increase his activity, the symptoms have come back. We're not going to put him at risk."