Majewski begins a three-match suspension following his straight red card in the 1-1 draw at Championship leaders QPR on Sunday.
Davies fears injuries and suspensions could take their toll on his threadbare squad, and ultimately the club's promotion challenge.
The Scot is still unable to call upon Dexter Blackstock due to a knee injury and Robbie Findley and Guy Moussi, who are both nursing thigh complaints.
He said: "Radi is now going to be out for three games, which is a massive blow. How many central midfield players have we got now? We have two left."