MacGill, 50, was allegedly assaulted and then released.
Four men have been arrested.
About 8pm on April 14, MacGill was allegedly confronted by a 46-year-old man near Cremorne.
A short time later the pair was approached by two other men and MacGill was allegedly forced into a vehicle.
He was then driven to a property at Bringelly, about 50 kilometres west of Cremorne, where the two men, plus another unknown man, allegedly assaulted MacGill and threatened him with a firearm.
About an hour later, MacGill was driven back to Belmore, in Sydney’s inner-west, and released.
The incident was reported to North Shore Police Area Command on April 20, six days after the alleged kidnap.
Officers today raided homes at Sutherland, Caringbah, Brighton Le-Sands, Banksia and Marrickville.
MacGill was a leg-spin bowler who claimed 208 wickets in his 44 Test career.
Investigations are continuing.
NSW Police are scheduled to brief media at 1pm (AEST).