Milan fell to a disappointing 2-0 defeat away to Torino on Sunday night, which leaves their hopes of a top four finish hanging by a thread.
The result has continued Milan's torrid run of form, as they have picked up just five points from their last seven games in Serie A, which is the third worst record in the league over this period.
The Milan boss was far from happy with the mentality of his players, who he says are making things harder for themselves. As quoted by Football Italia, Gattuso said: "We are having less fun than two months ago and that takes a toll.