The Welshman has been in excellent form of late as he put in a match-winning performance to help his side come from behind to beat West Ham United on Monday.
"Gareth Bale is very, very special," Ardiles told The Sun.
"Once in a while, you have somebody who comes along who is very special. Somebody like Jimmy Greaves, Pat Jennings or Glenn Hoddle. He is that special right now — and he's only going to get better."
Tottenham take on Arsenal in the North London derby on Sunday.