Speaking on Radio Bianconera's "Cose di Calcio" programme, the 89-year-old former Juventus general manager was blunt in his assessment of Sunday's opening-weekend performance.
"I saw them playing on the break quite often on Sunday, which means Juventus doesn't scare anyone anymore — it's the one who's scared," he said.
"You can remedy that with a top-level reinforcement in midfield, which is why, if Kessié arrives, well done to the management.
"The former Milan man is someone who can bring order and personality, he has legs and knows how to score goals, he can act as a shield and help the team break forward. I trust Carnevali and Massara, and Juventus fans should trust them too — let them work."
Juventus's front two had chances to make the win more comfortable than the scoreline suggested, with Randal Kolo Muani and Francisco Conceição both missing clear openings before Gleison Bremer's header settled the contest. Head coach Luciano Spalletti addressed those misses in his own post-match comments, prompting a pointed response from Moggi.
"He missed the chance to stay quiet," Moggi said. "Kolo Muani? He's good at playing on the counter, while Conceição knows how to beat a man but can't be clinical. Carnevali and Massara are people who understand football, they know the squad needs changing, but it takes time."
Moggi closed by weighing in on Juventus's ambitions for the season, tying them directly to the club's ability to land Kessié.
"It's a Juventus that's poorly built but could aim for fourth place if the right midfielder arrives," he said.
Sporting director Frederic Massara and chief executive Giovanni Carnevali have been working for weeks to complete the Ivorian's free transfer, with Kessié said to have made Juventus his clear priority, though the deal remains contingent on the club first freeing up space and budget elsewhere in midfield.