Their pair were called up after Marouane Fellaini and Jordan Lukaku withdrew from the squad because of injury, the Belgian football association KBVB said.
Both missed club action at the weekend, with Manchester United's Fellaini suffering from a calf injury and Lukaku of Belgian league leaders Oostende out with a hamstring strain.
Mirallas returns after being dropped for last month's Euro 2016 qualifiers against Andorra and Israel, where Kums received his first call up but did not get a chance to win a debut cap. Belgium play Italy on Friday and Spain next Tuesday, both in Brussels.
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(Reporting by Mark Gleeson; Editing by John O'Brien)
