A terrorist who butchered UK soldier Lee Rigby in 2013 is seriously ill from COVID-19, according to reports.

Self-styled “soldier of Allah” Michael Adebowale, 29, fell sick two weeks ago while serving 45 years in prison for the sickening meat-cleaver murder of the fusilier in south east London in May 2013, The Sun said.

He was moved to a hospital for the second time in days as his condition deteriorated, the UK paper said.

“He’s in a very bad way and fighting for every breath,” a source told The Sun.

“It’s reached the stage where it’s a 24/7 battle. If he deteriorates much further, intensive care would be the next step. He’s very young to be affected so badly.”

The BBC confirmed Adebowale was seriously ill in the hospital but said he was not yet on a ventilator or in intensive care.

Adebowale — who now uses the name Ismaail Kuti — and fellow killer Michael Adebolajo, 36, ran down Rigby close to his barracks before hacking him to death in the road, even trying to cut off his head.

The pair then waited to confront arriving cops — with Adebolajo standing with his weapons still in his blood-soaked hand as he tried to justify the killing to horrified onlookers.

Rigby’s mom, Lyn Rigby, 53, told The Sun she would hate for the terrorist to die young from the pandemic — because she wants to see him “serve every day” of his lengthy sentence.

“It would not be justice for COVID to take this man prematurely and end the sentence handed to him,” she told the UK paper.