Young Richmond midfielder Matt Arnot will miss the remainder of the 2013 season with a back injury.

The 19-year-old had worked hard to establish himself in the senior team, playing four of the last five games in the seniors, before bad luck intervened.

“Unfortunately scans have shown he has a stress fracture in his back, which was a bit of a surprise to us,” said Richmond’s Elite Performance Manager, Peter Burge.

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“It’s really disappointing for Matt, and for Richmond.  But we’ll get him back for the pre-season, and get him going from there.”

Richmond finished Sunday’s game against Sydney with minimal rotations, after Ricky Petterd and Ty Vickery suffered game-ending injuries.

Petterd is expected to miss at least one match with a groin strain, while Vickery will need to pass a concussion test later this week to prove his fitness for this Saturday’s game against Hawthorn.

Jake King, who missed last week’s match with hamstring soreness, will also undergo a fitness test during the week.

Matt Dea (shoulder), Ben Griffiths (concussion) and Brett O’Hanlon (concussion) all failed to see out Coburg’s VFL match against the Northern Blues on Sunday.

The trio will be assessed throughout the week before a decision is made on their fitness. Click here to view Richmond's full injury list.