North Melbourne recruit Zac Fisher is facing a setback in his return to action from a hamstring injury, with new scans showing a strain for the Roos defender.

Fisher sustained the initial damage to his hamstring earlier this month at a club match simulation session, with the former Carlton forward having since joined the Kangaroos' rehab group.

The 25-year-old's return to full training was unclear following the ailment, with Fisher's most recent scans now showing a minor strain to his hamstring.

According to 7 News reporter Mitch Cleary, Fisher is facing another delay in his rehabilitation process.

"After initially being cleared of hamstring damage a fortnight ago, scans this afternoon have confirmed a fresh strain for North Melbourne recruit Zac Fisher," Cleary reported on Tuesday.

North Melbourne's casualty ward is currently home to a handful of senior figures less than a month out from the club's first practice game of the pre-season.

MELBOURNE, AUSTRALIA - NOVEMBER 17: Zac Fisher of the Kangaroos handballs during a North Melbourne Kangaroos AFL training session at Arden Street Ground on November 17, 2023 in Melbourne, Australia. (Photo by Quinn Rooney/Getty Images)

Eddie Ford (ankle), Aidan Corr (ankle), Jackson Archer (groin), Tristan Xerri (cheekbone) and Luke McDonald (hamstring) are all listed to be multiple weeks away from reaching full fitness, with the latter showing strong signs on the track in the past week.

Midfielder Tarryn Thomas is also dealing with a groin issue that could have him sidelined for the next month, however, the young Roo is also facing an uncertain future in the AFL amid an investigation by the AFL into recent allegations of inappropriate behaviour toward a woman.

Key defender Griffin Logue is still some time away from a return as he continues to recover from an ACL injury sustained last July.

North Melbourne will face Collingwood and St Kilda during the pre-season in the lead-up to their Round 1 meeting with GWS on Saturday, March 16 at GIANTS Stadium.