"I'm confident it will never happen," he told the Times . "If it did, I'd resign."
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When we have spent big, normally it's been very good business," he continued. "Torres, (Javier) Mascherano, (Pepe) Reina, (Xabi) Alonso.
"(Robbie) Keane is a good player but we had to sell him because he was not playing at the level we knew he could play. Ryan (Babel) was signed for the future and we are waiting for his improvement. He has to be more consistent.
"With the fringe players, we needed to take a gamble on Bosmans and one, two million-pound players. Some of these players have not been good enough for us.
"It is a risk you have to accept when there is not too much money about."
Benitez also defended his decision to spend £17 million on an injured Alberto Aquilani this summer.
The former Roma player, who was brought into replace the departed Xabi Alonso, is only now reaching full fitness, but Benitez has every confidence the deal will prove worthwhile.
"We can only buy one or two big, £20 million players a year," he said. "If we want to have money available then we have to sell some players. We have to sell expensive and buy as cheaply as possible.
"Aquilani fit would be £20-30million. We checked with doctors and they said he would be out one, maybe two months. We have lost some time, but I signed the player for five years, not five weeks."