The 66-year-old 18-time Grand Slam singles champion declared she has the "all clear" from her doctors and expressed her gratitude in a tweet on Monday.

"After a day full of tests at Sloan Kettering, I got the all clear!" she said.

"Thank you to all the doctors, nurses, proton and radiation magicians etc- what a relief:) #byebyecancer :) and yes, #f***cancer !!!"

The former tennis number one was diagnosed with throat and breast cancer earlier this year in January and previously underwent treatment for early-stage breast cancer in 2010.

At the time, she said: "This double whammy is serious but still fixable, and I'm hoping for a favourable outcome.

"It's going to stink for a while but I will fight with all I have got."

In March, in an interview on Piers Morgan Uncensored on TalkTV, the 18-time Grand Slam singles champion said that her doctors gave her the all clear from throat and breast cancer.

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"As far as they know, I'm cancer-free," she told the host.

In the interview, she said that she would undergo some preventative radiation for two weeks on her breasts, but following that, "I should be good to go."

After her latest health update, the star was met with much support from friends and fans on the platform.

One user shared their experience with cancer as they congratulated Navratilova.

They said, "This is fantastic news and I'm absolutely thrilled for you and your family.

"I'm finishing up high-dose chemo and will be heading for radiation in the coming weeks. You give me hope and are an inspiration, Martina."

Another user added: "Congratulations, Martina! This is wonderful, wonderful news."

What are some of the symptoms of throat cancer?

Throat cancer, also known as Laryngeal is a type of cancer which affects the voice box.

According to the NHS, some of the symptoms include:

• A change in your voice, such as sounding hoarse

• Pain when swallowing or difficulty swallowing

• A long-lasting cough or breathlessness

• A persistent sore throat

• A high-pitched wheezing noise when you breathe

• In severe cases, difficulty breathing