Mourinho, who left for Real Madrid, led Inter to the Serie A title, the Italian Cup and the Champions League.
Inter are 13 points behind Serie A leaders and arch-rivals AC Milan and struggling for form.
"There are three possibilities for the club," said Benitez. "One, 100% support for the coach and buy four or five players to build a stronger team with competition among the players to be able to carry on winning matches and trophies.
"Two, carry on like this without a project, without planning, and go ahead with one person to blame, for the whole season.
"The third," he added, "is to speak to my agent to reach an agreement if there is not this support. Simple."
Inter president Massimo Moratti was less than impressed by Benitez's comments and said they "were not suitable for the situation" before adding it was "not the moment to ask for reinforcements".
Utterly priceless, all of that.
Inter are 13 points behind Serie A leaders and arch-rivals AC Milan and struggling for form.
"There are three possibilities for the club," said Benitez. "One, 100% support for the coach and buy four or five players to build a stronger team with competition among the players to be able to carry on winning matches and trophies.
"Two, carry on like this without a project, without planning, and go ahead with one person to blame, for the whole season.
"The third," he added, "is to speak to my agent to reach an agreement if there is not this support. Simple."
Inter president Massimo Moratti was less than impressed by Benitez's comments and said they "were not suitable for the situation" before adding it was "not the moment to ask for reinforcements".
Utterly priceless, all of that.