Motorsport.com understands the Phil Munday-owned 23Red Racing entry, run as part of the four-car Tickford outfit, has lost its major backing from Milwaukee Tools – which is expected to be made official tomorrow.
As a result Bathurst 1000 winner Will Davison is likely to lose his full-time seat with the squad, and is understood to have already enquired about potential enduro drives.
One serious contender for the Davison seat is Courtney, a deal that would come as part of a lifeline sponsorship deal from Boost Mobile for the fourth Tickford Mustang.
Boost has been a long-time backer of Courtney, and vowed to follow the 2010 Supercars champion after his split with Team Sydney before the Australian Grand Prix.
Courtney and Boost had been close to a wildcard deal with Erebus, before this Tickford opportunity was created by the Milwaukee exit.