Nottingham Forest midfielder Arron Davies has withdrawn after picking up a calf injury during Tuesday's Carling Cup win over Morecambe a\nd Eardley has replaced him. Eardley has been replaced in the U21's by Cardiff City's Jon Brown.
Goalkeeper Rhys Taylor has also been added to the squad replacing the injured Lewis Price.
The uncapped Chelsea keeper, 18, has yet to make a senior appearance at Stamford Bridge and had been in the Under-21 squad to face Romania.
Derby goalkeeper Price was forced out with a cartilage injury.
Sheffield United striker David Cotterill has also been added to the squad and Oldham Athletic's Craig Davies was set to join him.
But he has been withdrawn by his club on disciplinary grounds after being sent off for a head-butt on Tuesday night.
Wales squad to face Georgia in Swansea on 20 August:
Myhill (Hull), Taylor (Chelsea), S Evans (Wrexham), Morgan (Peterborough), Ricketts (Hull), A Williams (Swansea), Crofts (Gillingham), Eardley (Oldham), S Davies (Fulham), Fletcher (Crystal Palace), Tudur Jones (Swansea), Koumas (Wigan), Parry (Cardiff), Robinson (Toronto), Stock (Doncaster), Vaughan (Blackpool), Earnshaw (Nottingham F), Easter (Plymouth), Eastwood (Coventry), Cotterill (Sheff Utd).