Nick Kyrgios has hit out at Wimbledon champion Jannik Sinner over his decision to re-appoint the fitness coach he split with after last year’s positive tests for banned substance clostebol.

Jannik Sinner has reappointed fitness coach Umberto Ferrara to his coaching team having previously dropped Ferrara during Sinner’s recent doping suspension.

Wimbledon champion Jannik Sinner has rehired Umberto Ferrara as his fitness coach nearly a year after firing him for his role in the top-ranked player’s doping case.