Ronaldo joined Juve from Real Madrid in the summer of 2018 for a fee believed to be in the region of €100m (£88m) after nine years in Spain.
The transfer saw the end of the Ronaldo vs. Lionel Messi duels, at least domestically, and many felt that La Liga would suffer without one of its biggest names.
However Tebas shot down this belief in an interview with Spanish daily Marca.
When asked whether the potential departures of Lionel Messi and Sergio Ramous would affect the La Liga brand, Tebas replied: "Obviously, I don’t want them to leave La Liga, but if that were to happen, we’d all have to give more to take up the slack,” he said.
“Cristiano Ronaldo left, as some haters reminded me on Twitter. I can assure you that nothing has changed for us. To be honest, I don’t think Serie A has improved much either, they barely noticed his arrival.
Ronaldo has scored 71 goals in 94 games in all competitions for the Bianconeri since his arrival in Italy. He's won two league titles and a single Italian Super Cup.
La Liga's current TV rights contract, combining both domestic and international, is worth close to €2bn a season.
Serie A's latest TV deal is worth an estimated €1.3bn a season.