Nikolay Karamyshev has finalised a two-round World Touring Car Championship deal with the Campos SEAT squad.
AUTOSPORT revealed earlier this month that the Russian driver was in line to race in two of the events Hugo Valente is missing.
Karamyshev will make his debut in his home round at Moscow in a fortnight and stay on for the subsequent Porto street races.
He won the Super Production class title in last year's European Touring Car Cup.
Valente will return for the non-European events in the second half of 2013.