Sydney youngster Brandon jack has signed a two-year contract extension, tying him to the club until the end of the 2017 season.

Jack enjoyed his best season yet at AFL level, playing 10 games in 2015.

โ€œBrandon played a fair bit of football for us in the back half of the season and he brings some real speed into our side," Sydney coach John Longmire said.

โ€œHe is a guy that works really hard at his game, is always at the club and leaves no stone unturned in terms of the way he prepares.

โ€œI am sure whatever happens next year Brandon Jack will give himself every opportunity because that is the sort of kid that he is.โ€