Paris, France, 24 May 2015 | AAP

Seeded duo Bernard Tomic and Nick Kyrgios have dispelled lingering fitness doubts in a double boost for Australia’s French Open hopes.

Tomic, Australia’s top-ranked men’s player, retired with a virus during his opening-round match at last week’s Nice Open before Kyrgios pulled the pin midway through his second-round encounter with elbow soreness.

But both Grand Slam quarterfinalists declared themselves ready for Sunday’s start to the claycourt major after enjoying solid first hit-outs at Roland Garros on Saturday morning.

“I’m OK. I’m carrying some niggles here and there but that’s normal,” Kyrgios said ahead of his tournament opener on Tuesday against Denis Istomin.

“All in all, I’m feeling good. I’m feeling ready and I feel comfortable out on the court.”

Kyrgios is accustomed to playing injured.

The 20-year-old played just one ATP match in four months before powering into the Australian Open quarters despite a stress fracture in his back.

“At the Australian Open, my back was really bad. I had to take a couple of months off afterwards,” he said.

“But I’m feeling way better than I felt then, so that in itself gives me confidence. If I can make the quarterfinals of the Australian Open with a bad back, I can do some special things healthy.”

Tomic didn’t hold back during a sweaty hour-long session at Roland Garros on Saturday morning with American buddy Jack Sock and said he too would be ready for his opener on Tuesday against dangerous Italian qualifier Luca Vanni.

“I’m still sick but it’s OK. I did the right thing by not playing on in Nice and I’m confident for this match,” Tomic told AAP.

“But it’s not easy because this guy beat me already and it’s always tough to play a qualifier.”

Tomic, who has slashed his ranking by almost 100 spots in the past 10 months to be seeded 27th in Paris, arrived from his Monte Carlo base on Friday.

He said he was feeling “probably 80, 90 per cent” after resting for the past five days and was more concerned about his opponent than his health heading into the claycourt major.

“If this sickness goes away, I should be OK,” he said.

“But it’s been with me now for the last week, so it’s not something you want to bring into the French Open for sure.”

If Tomic avenges his loss to Italy’s world No.117 in Madrid earlier this month, he could face Australian Davis Cup teammate Thanasi Kokkinakis in the second round.

On debut in Paris, 19-year-old Kokkinakis also faces a qualifier on Tuesday in Georgian Nikoloz Basilashvili.