The former Rossoneri boss has voiced his opinion that the Brazil international would have acted wise to leave the Serie A champions for the big-spending French outfit
The Ligue 1 side had reportedly already reached an agreement with the Rossoneri about a transfer fee, but the move eventually collapsed after the Brazil international decided to stay with the Serie A champions instead.
"Pato? He is a great player! However, I think it would have been better for him had he left Milan last week," Sacchi was quoted as saying by Corriere della Sera.
Sacchi then went on to discuss Milan's interest in Manchester City attacker Carlos Tevez as Pato's replacement, and voiced his surprise that club owner Silvio Berlusconi is keen on the Argentine.
"It seemed a bit strange to me that Berlusconi would like Tevez as a player. It's weird that someone who likes Ronaldinho so much would prefer Tevez to Pato."
Paris Saint-Germain coach Carlo Ancelotti admitted earlier this week that a January transfer for Pato is very unlikely, but stressed that PSG are likely to make another offer in the summer.