Ex-Marussia Formula 1 driver Will Stevens will team up with Rene Rast in a sixth entry for the WRT Audi squad in this year's Blancpain Sprint Series.
The Briton, who was recently confirmed as a Manor WEC driver, also appears on the entry list for the Blancpain Endurance Series alongside two yet-to-be-confirmed teammates.
Audi factory driver Rast will also combine his Blancpain commitments with an LMP2 programme, having signed to join the G-Drive WEC team.
WRT Audi had previously revealed a five-car entry for the BSS and a four-car entry for the BES, but these efforts have now expanded to six and five Audi R8 LMS machines respectively.
The Belgian squad took the overall Blancpain GT teams' title last year, with Robin Frijns winning the drivers' contest ahead of Bentley's Maximilian Buhk.
Former European F3 driver Markus Pommer has also been confirmed for the Sprint Series in a Phoenix-run Audi R8 that he will share with Danish racer Nicolaj Moller Madsen.