Anthony Joshua out of Kevin Johnson fight with back injury

England's Anthony Joshua has won all 10 of his professional fights

Unbeaten English heavyweight Anthony Joshua has pulled out of his fight with American Kevin Johnson on 31 January after aggravating a back injury.

A scan showed Joshua suffered a Pars Stress Fracture, and withdrew from the bout after medical advice.

The 25-year-old said: "This injury is something I need to get sorted as soon as possible."

Joshua recorded a first-round stoppage against England's Michael Sprott in his most recent fight.

Promoter Eddie Hearn said: "After receiving news from the scan, he was left with no option but to rest his back."

Hearn says the Watford-based fighter hopes to return in April.