Four horses from Greg McFarlane's stable have been cleared to race at Wellington on Tuesday after being transferred to Wyong trainer Don Robb.

McFarlane is the subject of an ongoing inquiry into the attempted tubing of Ferocimo a couple of hours before he was due to run at Rosehill on Saturday.

Racing NSW stewards have taken tests on several horses in the stable and barred McFarlane's nominations until the outcome of the inquiry.

On Monday the approved the transfer of Rubykin, Here Comes The Sun, Primus Equus and Belegic to Robb's name.