Jannik Sinner has rehired his former fitness trainer, Umberto Ferrara, who left his camp last year after the Italian twice tested positive for the banned substance clostebol

Wimbledon champion had sacked Umberto Ferrara and his physiotherapist last year for their roles in his testing positive for banned substance.

Tennis world No 1 Jannik Sinner has brought back fitness trainer Umberto Ferrara to his coaching staff, despite Ferrara's central involvement in the doping controversy that resulted in a three-month suspension for the Italian player.