Redknapp believes temporary substitutions should be introduced in order for head injuries to be properly assessed. If a player requires additional treatment, then the temporary sub could become a permanent call whereas if an injured player could be reintroduced into the competition, then the temporary sub returns to the bench.
"You couldn't wait ten or 15 minutes with 10 men, you just couldn't do it," said Redknapp to reporters who was speaking in the aftermath of Sandro having to come off against Southampton due to a head injury.
"So you couldn't give medics that amount of time to look at a player but it doesn't sound the worst idea for a temporary replacement, so that the doctors could have a longer look at the player with the potential head injury.
"Medical people have got to be so careful, they can't take a chance because if anything went wrong there would be massive trouble. If someone is very bad, you cannot expect them to carry on because if something went wrong we would all be very sorry."
Southampton defeated QPR by a 2-1 score but Sandro, who suffered a concussion, has been cleared for upcoming duty.
"At half-time, there didn't seem to be a lot wrong with Sandro. He was fine in the changing rooms, he didn't look too bad at all but obviously the doctors have got to err on the side of caution."