Kessel Racing, Daiko Lazarus Racing, Car Collection Motorsport and 961 Corse have all pulled Pro-Am Cup entries ahead of this weekend’s Total 24 Hours of Spa while Antonelli Motorsport has joined the field.
The changes were revealed in an updated provisional entry list for the joint Blancpain GT Series and Intercontinental GT Challenge round released on Friday.
Lazarus has scaled down to a one-car program in the Silver Cup after withdrawing the Pro-Am Lamborghini Huracan GT3 which was set to be driven by Giuseppe Cipriani, Miguel Ramos and Fabrizio Crestani.
The 961 Corse Ferrari, which included Giancarlo Fisichella and Michele Rugolo, has also been withdrawn, as has Car Collection’s Audi R8 LMS GT3 following an injury sustained by Dimitri Parhofer.
Kessel has withdrawn its only entry with Michael Broniszewski still recovering from an injury sustained in the paddock at Monza in April.
He was listed to make his return at Spa alongside Alessandro Pier Guidi and Giacomo Piccini.
The Swiss squad was set to provide support for the Am Cup-entered T2 Motorsport crew but the No. 75 Ferrari will instead be run by AF Corse.
Antonelli has been added to the entry list, meanwhile, bringing the car count to 65 entries.
The Italian GT Championship regular will campaign a Lamborghini Huracan GT3 for Juan Perez, Gianluca Giraudi, Loris Spinelli and Giacomo Altoe.
While the pair of Muehlner Motorsport Porsche 991 Cups are still listed in Group National, both lineups are entirely TBC and so it is yet to be seen whether the cars will make the race.
On-track action for the joint Blancpain GT and IGTC round will kick off with the Bronze Test on Tuesday.
Laurent Mercier contributed to this report.