Carlton star Sam Docherty has suffered a ruptured ACL at training on Wednesday in a huge blow for the 24-year-old and the Blues' 2018 season.

The club has confirmed Docherty will undergo traditional knee reconstruction surgery which will see him miss the next 12 months of football.

โ€œAs we commence our pre-season campaign, the news of Samโ€™s injury is incredibly disappointing for everyone but foremost for Sam,โ€ Head of Football Andrew McKay said.

โ€œSam is a total professional and a resilient young man and we know he will face his rehabilitation process with the utmost dedication. 

โ€œAs a terrific young leader at our club, Sam will continue to work with the leadership group and assist in the development of our young players both on and off the field. 

โ€œWhile we are incredibly disappointed by the long-term nature of Samโ€™s injury, it provides an opportunity for our young defenders to continue to train hard over the pre-season to solidify their spot in the backline in Samโ€™s absence in 2018.โ€