AC Milan legends Marco van Basten and Ruud Gullit believe the Italian club have taken a risk by appointing Clarence Seedorf as their new coach.
Seedorf, 37, takes charge for the first time this weekend against Verona after being appointed as Massimiliano Allegri's successor on Thursday.
It is the ex-Netherlands midfielder's first managerial position.
"Clarence has no experience as a coach and will have to prove himself quickly," Gullit said.
His former Netherlands team-mate Van Basten - like Gullit, a member of Milan's European Cup-winning teams of 1989 and 1990 - also questioned the appointment of Seedorf, who quit playing for Brazilian side Botafogo to replace Allegri.
"Milan is a massive club that is currently suffering from a lot of problems," said Van Basten. "I think they could have rather used an experienced coach."
Allegri was sacked after a 4-3 loss at minnows Sassuolo left Milan in 11th at the halfway stage of the season.
The 18-time champions are already 30 points adrift of leaders Juventus and 20 behind third-placed Napoli, who occupy the final Champions League qualification spot.
Seedorf will be without Giampaolo Pazzini for his first game in charge at the San Siro after the Italy striker was ruled out with a thigh injury.
