Inter Milan head coach Walter Mazzarri admitted that he should have made more changes to his side following the 4-1 loss to Cagliari on Sunday afternoon.

The Inter boss believes that a number of key players, including Nemanja Vidic, were short of full fitness, and took a large portion of the blame when speaking to reporters after the game.

"[Vidic] is probably one of those I used too much," he added. "He's strong and a leader so I didn't want to rest him but he was fatigued and therefore below par.

"I take responsibility for that, as I should've made more changes and realised there are players who, at this moment, cannot play three or four times in a row.

"Fatigue has an effect on your physical and psychological performance. Some players weren't sharp and all it takes is half a metre or your body leaning the wrong way when a player runs at you and there isn't the strength to make up for it."

Inter are currently fifth in Serie A.