Ronaldo departed the 13-time European champions after nine glittering seasons for a record switch to the Serie A champions.
While the 34-year-old has excelled and currently leads the league's scoring charts towards their eighth consecutive title - he was said to be acquired to secure continental glory for the Italian giants.
However, Ibrahimovic doesn't believe that constitutes much of a challenge, despite the Sweden superstar never winning the UEFA Champions League during his career.
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"I didn't say his transfer wasn't great," Ibrahimovic told DAZN. "I said that it wasn't a challenge to join Juventus.
"It's not a challenge to go to one of the best teams in the world. Maybe it depends on what you mean by challenge.
"For me, a challenge is joining a team and taking them far. That's a challenge."
The five-time Ballon d'Or winner has scored 20 goals and registered 11 assists in 31 games across all competitions this season.