Nadal has been installed as favourite to win the French Open in 2017 owing to his current form on clay.
Nadal picked up his second title of 2017 at the Barcelona Open on Sunday (30 April).
Toni Nadal also spoke about the current tennis season being his last with his nephew.
Federer will return to action at Roland Garros after an eight-week break.
Federer had previously expressed doubts on whether he should skip the clay season.
Federer is set to miss the clay court tournaments in Monte Carlo, Barcelona, Madrid and Rome this season.
Sharapova is currently in the semi-final of the Porsche Grand Prix in Stuttgart, Germany.
Nadal has made 4 finals in 6 tournaments thus far in 2017.
Rafael Nadal won his 10th Monte Carlo Masters title on Sunday, 23 April.
Federer has won three of the four tournaments he has played in 2017.
Sharapova will return from her 15-month suspension in next week's Porsche Tennis Grand Prix.
Rusty world number one opts for Catalonia over Budapest as French Open preparations continue.
Becker also said the French Open will be 'extremely exciting' this year.
World number one faces Giles Muller in first match for five weeks in the principality.
Federer had previously revealed that he would take a 10-week break before playing in Roland Garros.
Nadal is aiming to make it 10 titles at the Monte Carlo Masters.
World number one lost 3-6, 6-7 to 18-time Grand Slam champion at Zurich's Hallenstadion.
Federer has won three titles in 2017 and lost just once in his last 20 matches.
World number one targets French Open return but still unable to serve properly.
Former French Open champion discusses Federer's renaissance and Rafael Nadal's clay campaign.
Djokovic has defeated Nadal in their last three meetings on clay.
The events firm has expanded in the Middle East, China, Brazil and the UK over the last seven years.