Boxing great Muhammad Ali is in hospital with a respiratory issue, a family spokesman said.

Bob Gunnell said in a statement that Ali's condition was fair. A brief hospital stay was expected.

Former heavyweight world champion Ali, 74, has been suffering from Parkinson's disease for more than three decades.

Ali, who lives in Phoenix, Arizona, has suffered some health problems in recent years.

He was admitted to hospital in December 2014 with what was believed to be a mild case of pneumonia.

Doctors later determined he was actually suffering from a severe urinary tract infection, for which he received further treatment in hospital in January 2015.

In recent years, he has kept a low profile and his last public appearance was in April at the 'Celebrity Fight Night' gala in Arizona, a charity that benefits the Muhammad Ali Parkinson Center.

Nicknamed the greatest, he retired from boxing in 1981 with a 56-5 record.

Sign up to our free newsletters

Get the best updates straight to your inbox:
Please select at least one mailing list.

You can unsubscribe at any time by clicking the link in the footer of our emails. We use Mailchimp as our marketing platform. By subscribing, you acknowledge that your information will be transferred to Mailchimp for processing.