Spurs host Inter Milan in the Europa League Round of 16 first leg and Villas-Boas feels the evolution of Welsh winger Bale will endure when the Italians come to town.
"I think Gareth has evolved as player. He is even more threatening now," he said.
"I remember seeing the highlights of Inter-Tottenham (from the Champions League a few years ago), and how Tottenham came back into the game late on.
"Maicon was an outstanding right-back, one of the Brazilian right-backs, so to see a young player like Gareth play like he did against him demonstrates his talent.
"Now, two years on, he plays in a different position. He's become a different player, a bigger player, and a more complete player.
"He's the kind of player who can determine the outcome of a game, as we've seen in recent matches."