A pectoral injury will sideline Fremantle forward Hayden Ballantyne for the rest of the AFL season.

In a huge blow to the Dockers premiership hopes, Ballantyne has been forced to undergo surgery for the injury suffered against Carlton on Saturday night.

The 28-year-old suffered the injury in the first quarter of Fremantle’s 42-point win over the Blues and was substituted at halftime.

Subsequent scans revealed the forward to have ruptured his pectoralis major tendon, requiring a surgical solution.

Last week, Carlton’s Bryce Gibbs was ruled out for the season with a similar injury.