Collingwood have suffered another blow on the injury front with 20-year-old ruckman Oscar Steene leaving the field at IKON Park with a foot concern.

The 201cm youngster was playing his first match for the season after passing concussion protocols from a head knock during the preseason.

He was cleared to play in Collingwood's VFL clash with Carlton but now may be sidelined further, pending a diagnosis on his foot.

The club is set to provide an update during the week.

The injury adds to a growing list of casualties at Collingwood during the bye round for the senior side.

Former captain Scott Pendlebury will be touch & go for Round 6 selection vs Port Adelaide after scans revealed a fractured rib suffered in Gather Round.

24-year-old key poster Nathan Kreuger injured his calf after being cleared to play from a hamstring strain. His recovery will be delayed for at least another two weeks.

Nathan Murphy remains sidelined with concussion concerns but hinted at a potential comeback during the season earlier this week, sharing a desire to return as his confidence grows.

Collingwood return from their bye with a Saturday afternoon Round 6 clash against Port Adelaide at the MCG.