The former Italy international remains in full support of the Rossoneri coach, and believes there have not been many better men in charge of the San Siro side.
The 52-year-old Tassotti, who made over 400 league appearances for the Rossoneri between 1980 and 1997, currently works as Allegri's assistant at the 2011 Serie A champion and feels there is no reason to question the Milan coach.
"I am disappointed that there should be doubts over our coach, I am right behind Allegri," Tassotti stated at a press conference.
"I feel he is one of the best coaches Milan have had since I was a player. I would put him up there in the top three or four the club has had."
Tassotti will be in charge of Milan for Wednesday's league game against Cagliari following Allegri's one-match ban.
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