THE WESTERN Bulldogs could regain versatile big man Jackson Trengove from injury for Saturday night's clash with Fremantle at Optus Stadium.

The 27-year-old sustained a cracked shoulder blade in the round three win over Essendon and was considered for the weekend's loss to Sydney, but the club erred on the side of caution.

Premiership big man Jordan Roughead resumed through the VFL on the weekend - after suffering concussion in round three - and got through Footscray's win over Coburg unscathed.

But that's where the good news ends for the Dogs, with third-year rookie Brad Lynch's horror run with hamstring injuries continuing.

The 20-year-old's latest setback is expected to see him sidelined for up to nine weeks after he pulled up lame chasing an opponent in the last quarter of the Whitten Oval clash.

It's a savage blow for the West Australian who is yet to make his senior debut. He will need to be delisted if he's not upgraded to the senior list at season's end.

Key forward Josh Schache appeared to hurt his ankle in his return from a calf injury and was seen icing the area during the last quarter, but the former Lion isn't recorded on the club's weekly injury list.

Defensive playmaker Hayden Crozier (knee) is still 2-3 weeks away from resuming, while mid-season returns for important defenders Dale Morris (knee) and Marcus Adams (ankle) are likely.