The 19-year-old said he was excited to re-sign and had relished the opportunity to learn from older ruck colleagues Todd Goldstein and Braydon Preuss and ruck coach Will Minson.
"I didn't really expect to get an extension this early on. I think it was round six when I got informed (it was on the cards), and I was pretty stoked with that," Xerri said.
"It's been lots of fun working out on the track with big 'Preussy'. He's not the easiest bloke to move around, it's a good challenge.
"And learning from 'Goldy' and big Will, when we do the vision … all three of them have been huge, lots of help."