The Netherlands hero, who led the team to the FA Cup in 1997, felt they were disappointing against Manchester City in the semi-final on Saturday.
Despite putting in a spirited display, they lost 1-0, while Gullit also focused on the penalty fiasco from their 6-0 win over Everton earlier last week.
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He told The Sun: It was like watching kids, children. In a proper team that doesn't happen. It's embarrassing.
For Pochettino it's embarrassing. For the board, it's embarrassing.
Can you imagine me having a fight with Marco van Basten, on the pitch? That's crazy? Or someone at United having a fight with Roy Keane."