Roger Federer warns Rafael Nadal and Novak Djokovic after Australian Open loss

Roger Federer still believes he can win more Grand Slam titles.

Roger Federer has warned his closest rivals that he is still out to add to his Grand Slam tally even though his hopes were dealt a big blow with an Australian Open semi-finals loss to Novak Djokovic.

Federer is leading the men's Grand Slam tally but he will not be able to win his 21st title in Melbourne.

The Swiss star was struggling with a groin injury as he was beaten 7-6, 6-4, 6-3 by Djokovic on Rod Laver Arena.

World No 1 Nadal was hoping to equal Federer's record this weekend but he crashed out at the quarter-final stage at the hands of Dominic Thiem.

That means 16-time Grand Slam winner Djokovic has the best chance to close the gap as he is through to the final and will take on the winner of Thiem vs Alexander Zverev.

At 38 years old it is unclear how many more chances Federer will get of winning a major tournament.

Roger Federer

Roger Federer wants to win more Grand Slam titles (Image: GETTY)

But he insists he can add to his total and keep his rivals at bay for a little longer.

"Yes, I do believe that," Federer said.

"I think by having the year that I had last year, also with what I have in my game, how I'm playing, I do feel that, yeah."

When asked where Federer felt his best chances of another title would come he joked: "Probably Basel or Halle. Less matches to play."

It has been claimed Djokovic has improved his second serve this season after working on it over the winter with coach Goran Ivanisevic.

However, Federer is unsure if the Serbian has raised his game to another level.

"Yeah, I mean, I don't know," Federer said. "I've played Novak on some days obviously also when he's very tough.

"I don't know if he was... I'm not here to talk, to be honest.

Roger Federer

Novak Djokovic beat Roger Federer in straight sets (Image: GETTY)

"But, yeah, I heard that he was hitting big on the second serve this tournament. But then again, you know, that just takes guts to do that. His first-serve speed, it's hard for me. Tough measuring stick, to be honest.

"But yes, I mean, he has definitely had a bit of ups and downs throughout his career with his serve.

"Right now it looks very good. He did have the problems with double-faults at some point. He did have the elbow issue.

"When he did come back, he didn't hit his spots very well. Now he's got them all back. Looks very solid. Credit to him to get that done."