Messi has been in sumptuous form this season, and scored two goals in Barcelona's 3-1 win over Athletic Bilbao in the Copa del Rey final on Saturday.
It was Messi's first goal in the 20th minute that captured everyone's attention as he left four Bilbao players trailing in his wake before giving Barcelona a 1-0 lead courtesy of a sensational strike.
But, Chiellini believes that Messi wouldn't have been able to score a goal like that if he were playing in Italy.
"It was certainly a great goal," Chiellini told reporters ahead of Juventus' Champions League final clash with Barcelona in Berlin this weekend. "I don’t think Messi would be able to score a goal like that in Italy, where the defending is much better than in Spain. There’s better football in La Liga but worse defending.
"But Messi is now the god of football. It’s difficult to compare him with Diego Maradona, Pele and company, but he’s probably the best player of the last 30 years."
Meanwhile, Chiellini also confirmed that he will meet and greet Barcelona striker Luis Suarez even though the latter bit him during last year's World Cup.
Chiellini also pointed out that there is no bad blood between him and Suarez and added that he was looking forward to playing against the Uruguay international.
"Of course I’ll greet him before the game," he said. "Those who know me know that there won’t be any problems. Nothing has changed between us.
"It’ll be like greeting Karim Benzema or Javier Hernandez. I’ll be attentive to his movements.
"But Juve come into the Champions League final with great credit and humility. If we do things bravely and limit Barca’s qualities, we’ll have a chance."