Modric was fervently linked with the Nerazzurri after guiding Croatia to the 2018 FIFA World Cup final, but Real managed to keep hold of their star playmaker after they'd already sold Cristiano Ronaldo to Juventus.
Ausilio was speaking at the book launch of Dr. Piero Volpi (h/t Calciomercato.com) and said: "Modric is impossible in January. We also look at the zero-parameters market and we know where to look, but the most important thing for the next market will be quality."
Modric was named FIFA's The Best Player for 2018 after a rousing runners-up finish in Russia, not to mention the instrumental hand he played in helping Real to a third successive UEFA Champions League crown.
It's unsurprising the puppeteer has therefore also made it onto the ballot for this year's Ballon d'Or, hoping to add to his haul of individual awards for 2018, via France Football:
So serious was Inter's alleged interest in Modric that Real even reported his suitors to FIFA, but BBC Sport confirmed in September the Nerazzurri would face no punishment for their pursuit. This was despite reports Inter had contacted Modric in August, when he was two years into a four-year Real contract.
Inter invested in their squad all the same this past summer and added Radja Nainggolan to their ranks after he was convinced to leave AS Roma, though it appears a January recruit of Modric's quality is off the cards.
It speaks volumes of Modric's talent and how well-respected he is inside elite football circles that Chelsea star Eden Hazard, who will likely be another Ballon d'Or contender, backed Real's maestro for the win, via Goal:
At the same time as dismissing the chance of a winter move for Modric, Ausilio added that one of his Croat compatriots, Marcelo Brozovic, is close to signing an extension: "The renewal of Brozovic is almost completely defined."
Brozovic resides in Milan with countrymen Ivan Perisic and Sime Vrsaljko—on loan from Atletico Madrid—and it was suggested that Croat contingent could be one of the main tools used to prise Modric from Madrid.
Modric turned 33 in September but will enter the last year of his contract at the Estadio Santiago Bernabeu in June, at which point it should be easier to convince Real to sell.
Real president Florentino Perez said in August that Modric couldn't leave Real unless his €750 million (£668 million) release clause was met, and Ausilio doesn't appear any more confident of striking a deal in January.