Austin Collie (photo courtesy of the Indianapolis Colts)

Scott Collie says he won't tell his son to stop playing professional football.  And a neurologist from Indianapolis, where the son plays wide receiver for the Colts, agrees that the decision must come from Austin Collie himself.  

"With amateurs and younger people...we have to protect these people even more," says Dr. David Josephson, Josephson Wallack Munshower Neurology.  "But professionals, they have to weigh the pros and cons of everything that they do."

The elder Collie tells CBS his son will keep playing as long as the Colts will have him.  Coach Chuck Pagano has deferred on the question, saying the doctors know more about it than he does.  

And David Josephson is a doctor.  

"Head trauma's real serious and repeated head trauma is even more serious," he said.  "And we know that it can lead to brain impairment, both acutely and chronically."
 
When he was hit last Sunday night in Pittsburgh, Collie suffered his fourth concussion in 15 months.