The 23-year-old has recently been linked the likes of Manchester City, CSKA Moscow, AC Milan, Inter Milan and Napoli.
But Cellino has now revealed that Nainggolan will join Juventus in the summer for around £12.5million.
He told Tuttosport: “I have laid a pact of honour with Juventus for Nainggolan. Unless they change their minds in June then I expect Radja to be wearing the famous black and white shirt.
“I gave my word to (Juventus’ sporting director, Giuseppe) Marotta.
“Radja was enchanted by the Juventus stadium when he came to play with Cagliari.”
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Liverpool have unveiled their new home kit for next season, sticking with the hugely popular retro styling of the current shirt.
The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.