One of the best defenders in the history of the game, Maldini is certainly qualified to assess the merits of Milan's marquee signing and the 49-year-old, who hung up his boots in 2009, is a fan of his Azzurri successor.
"It's certainly difficult to find [good] centre-backs and Bonucci's one of the best," he told Sky Italia.
"Bonucci's certainly an excellent buy.
"It seems a bit early for them [Milan] to go for the Scudetto, but they'll fight for a place in the Champions League."
According to Maldini, the full impact of Bonucci's departure from Juve will not be known until the end of next month and may depend on the Scudetto holders' own recruitment activity.
"First of all, we have to say the transfer window is still open and that we have to wait until it's closed before we can pass judgement on any team," he said.
"But Juve's strength is their group, which has been in place for several years now."