Former West Ham and Rangers centre-back Dailly came through the full 90 minutes of Saturday's 3-2 win over Wycombe despite carrying a rib injury, and he is unlikely to be risked.
Llera, a summer signing from MK Dons, needed 11 stitches in a head wound and right-back Richardson was limping throughout the second half.
Jose Semedo, Grant Basey or youngster Chris Solly could be drafted into the backline with the Addicks squad already looking stretched.
Striker Andy Gray came on as a second-half substitute at the weekend after seven months out with a pelvic injury and could figure again.
Midfielder Dean Sinclair is still sidelined with a knee injury.