WINLESS North Melbourne's injury-decimated season has been hit further with Aiden Bonar and Dom Tyson joining Jaidyn Stephenson in suffering fresh setbacks. 

Bonar will go under the knife on Thursday to repair a high-grade medial ligament injury he sustained in Saturday's loss to Collingwood. The ex-Giant is expected to miss 8-12 weeks. 

Scans have also revealed Tyson, who didn't play at any level last week, had re-injured his calf. 

It comes after Stephenson suffered a hairline fracture in his scaphoid in his wrist against his former side, an injury that is expected to sideline him for up to six weeks.

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"Jaidyn reported some soreness in his wrist post-game and was sent off for immediate scans," North footy manager Brady Rawlings said.

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"A very fine fracture was detected and a specialist advised surgery was required.

"Jaidyn can't recall a specific incident when the injury took place and will now be out for about six weeks."

The 18th-placed Roos' on-field woes have been exacerbated by injury this year, with the likes of Jed Anderson (ankle), Aiden Corr (toe), Kyron Hayden (hamstring), Luke McDonald (pectoral), Flynn Perez (knee), Jared Polec (hamstring) and Robbie Tarrant (kidney) in the rehab group. 

Will Walker has now joined them after fracturing his thumb in the VFL.

"Our depth is being challenged," Rawlings said.

"Attrition is part of the game and is not unique to our club. With it comes great opportunity for our younger players to step up and take their chances.

"We had Trent Dumont perform well in the VFL on Saturday, as well as Tristan Xerri and Taylor Garner, and want to see Eddie Ford make his debut in the near future.

"Bailey Scott and Atu Bosenavulagi were emergencies on the weekend and have fresh legs so we expect them to be available this week."

Stephenson has been a shining light in a tough year for the Roos, playing primarily on a wing with stints up forward, averaging a career-high 19.3 disposals and kicking 10 goals from his eight matches.