After skipping the clay court season for the past two years, Roger Federer has revealed he is unsure whether or not he will return next year, the Daily Express report.

The 37-year-old, who has decided to skip tournaments on clay in order to concentrate on the competitions he feels more confident of winning, is currently competing in the Paris Masters.

Justin Setterfield/Getty Images Sport

The 20-time Grand Slam champion usually spends the clay court season to prepare for the grass court season, however, the Swiss star failed to deliver on grass this year, with speculation over when he will retire growing after every tournament.

However, talking earlier in the week, Federer admitted he may well decide to compete on clay in 2019, even if that means not participating in every tournament.

I don‘t know it yet. During the holidays after London (ATP final) I want to decide if I want to play 2019 on clay again or not – and if yes: How much?

This decision will have influence on the whole planning and preparation for the new season.

I would have to slowly adjust my body already early for clay: The rallies are different, you have to slide.

What I don‘t want is to look back one day and to think: If I only had… This year it isn‘t the case, same as last year.

I want to say with a clear conscience: This was the right decision. That‘s why I take my time.

If Federer decides to appear at various events on clay, the veteran would presumably participate in the French Open, with his one and only previous triumph at Roland Garros coming back in 2009.