By Jack Bezants for MailOnline
Published: 12:03 GMT, 7 January 2020 | Updated: 14:58 GMT, 7 January 2020
Juventus manager Maurizio Sarri has warned Serie A that Cristiano Ronaldo is back to full fitness after the Portugal star put Cagliari to the sword with a hat-trick on Monday.
Ronaldo struggled to reach top form towards the end of last year and was notably substituted twice in November, when he went three games without scoring.
Now, Ronaldo is in electrifying form and has netted eight goals in his previous five appearances in the Italian league.
Cristiano Ronaldo is back at 100 per cent fitness, according to