Rafael Benitez believes Inter suffered despair last season because promises over signing new players were not maintained as he hit out once again at his former employers.
The Spanish coach's experience in Serie A was brief as he was ousted just four months into last season following a terrible run of results in the league, although he did pick up the Supercoppa Italiana and Fifa World Club Cup titles in that time.
Benitez was axed after complaining of a lack of investment and feels the failures the team endured during the course of the campaign lie with those who promised spending.
"Inter was a great opportunity. They promised us new players who would have improved the squad, but this never happened," he is quoted as saying on Tuttomercatoweb.com.
"We worked hard and I think that if the club had spent money and if we had never had any injuries, then we would have won."
Benitez was replaced by Leonardo, who led the club to a Coppa Italia win, but the Brazilian left for Paris Saint-Germain this summer to take on a director's role.