The pair, the two tallest players in the squad, picked up their knocks in Albion’s 33-20 opening day win over Richmond.
“Dan Collier has got a sore groin and was not able to train Monday or Tuesday,” said director of rugby Graham Dawe. “While Nile Dacres has a very badly bruised ankle, so he also hasn’t been able to take part in full training either.
“It has been a bit of a stop-start beginning to the week for those guys.”
Both players can play in the second-row and Albion’s options there are already limited due to David Fisher’s knee injury.
South African Fisher is making progress but will not be fit for this Saturday’s match against last season’s runners-up.
“Dave Fisher is still working on his playing comeback,” said Dawe. “He is moving more freely, but he has not started doing any field-based work yet.”
Dacres, who played number eight last weekend, appears the most likely to be fit for this weekend.
“I think Nile will be okay but we will have to monitor Dan Collier, who is a slight concern,” said Dawe.
“Harrison Cully has also not trained either. He’s still suffering with his back injury.
“Marc Koteczky is on an intensive programme to get him back playing. We hope that maybe he could be in the mix for selection after missing last week.”