The Austrian forward joined the Swans on a two-year deal on Saturday, but was unable to make his debut in the victory against Coventry as he had not received international clearance.
But Idrizaj completed his switch to the Liberty Stadium on Monday after being given clearance by the German FA and he goes straight into the squad to face Nigel Adkins' side.
Spanish midfielder Jordi Lopez could return to the starting line-up after being on the bench against the Sky Blues.
Boss Paulo Sousa still has a number of injuries to contend with as Joe Allen (hamstring), Ferrie Bodde (knee), Thomas Butler (groin) and Darren Pratley (shoulder) are all unavailable.
