Both players missed the home draw with Barnsley - on loan defender Bertrand with a hamstring problem sustained during the victory over East Midlands rivals Derby and captain McKenna through illness.
Dele Adebola returned from a knee injury on New Year`s Day and the big striker should be on the bench once more.
Davies made three changes against the Tykes and the Scot will shuffle his pack again.
Aaron Ramsey could make his second start for the club while fellow midfielder Paul Anderson, defender Kelvin Wilson and forward Nathan Tyson may also come into the reckoning.
Source: PA
Source: PA