The Partenopei will spend big in the next transfer window in a bid to strengthen their chances of both Serie A and Champions League success this season
The Partenopei currently lie third in Serie A, behind Juventus and Roma, while they face a tussle with Arsenal and Borussia Dortmund to reach the knockout stages of Europe's biggest club competition.
The 64-year old allowed Rafa Benitez to bring in a host of new faces over the summer but has no plans to bring a halt to his lavish transfer policy.
"In January, I will have to spend another €50m on players if we are to keep competing," he told Il Mattino.
"It is not easy to bring success if you don't spend enough money, and that is something I have to accept.
"It is crucial that we remain in the Champions League past Christmas in order to attract the top players, and [Rafa] Benitez knows that."
De Laurentiis also criticised former Napoli boss Walter Mazzarri, who moved to Inter in the summer after four years at the club.
"We helped Mazzarri become the coach he is today, but he went on to sell himself out [by joining Inter]," he said.
"But we did not beat ourselves up about it and we hired the best coach out there."