Jack Hayes has signed a two-year deal to remain at the Saints until the end of 2024.
The 26-year-old trained at Moorabbin during the pre-season and was signed as an SSP rookie, impressing as a mobile forward with pinch-hitting ability in the ruck.
The Woodville-West Torrens product made his AFL debut in Round 1 and duly monstered Collingwood's undersized backline in a losing effort.
That extension has today landed, with Hayes now well into a rehabilitation process.
St Kilda's head of list management, James Gallagher, told the club's website that Hayes has wowed the Saints in his short stay.
“What we’ve seen from him so far in the AFL, is exactly what we’ve observed for the past couple of years from him at SANFL level," he said.
“Jack’s already attacking his rehabilitation with the high level of professionalism we’ve become accustomed to from him, and we look forward to seeing him back up and running in the not-too-distant future.”