The Portuguese could be forgiven for bemoaning Redknapp's return to top-flight football, but the Spurs boss is happy to see his predecessor back in the game - and he has no doubt the west London club will survive under his leadership.
"It's good for the game that he is back," Villas-Boas said.
"He's a manager with more experience in the Premier League, a respected manager who is used to making impossible things turn possible.
"It is the kind of challenge that makes him even more motivated.
"I would put on a bet if I could that they would save themselves."