The Majorca-born player was rated as the world's 51st most heavy-hitting star in terms of media power, according to Spanish new site Te Interesa.
Forbes' list is compiled using criteria such as media visibility in newspapers, TV and radio, as well as mentions on social media like Facebook and Twitter.
It also takes into account entertainment-related earnings.
Oprah Winfrey, Lady Gaga, Steven Spielberg, Beyonce Knowles and Madonna clinched the top five spots.
Real Madrid's Portuguese star player Cristiano Ronaldo was rated 31st while his Barcelona-based football rival Leo Messi came in at 39 on the list.
Nadal has actually fallen in the celebrity power stakes, slipping from 47th place in 2012 .
This is not the only time Nadal has slipped up recently.
His coach and uncle, Toni Nadal, blasted the former World Number 1 on Wednesday after he was knocked out of the 2013 Wimbledon Championships in the first round by unseeded Belgian Steve Darcis.
Nadal's shocking, straight-sets defeat at the hands of a player ranked 135th in the world prompted his coach to say: "For me, what failed him most was his attitude."
"In other places you decide to keep going, fight, and in the end, in the best-case scenario, you can win," he told Spanish media at a sponsor's event on Wednesday.
"Here if you see yourself as less of a winner then it makes things more difficult for you and that's why I tell you that the attitude wasn't the best."