"I was interviewed earlier in the morning and I said then I thought Turncoat was our best winning chance," Pitman said.
"He was very unlucky last time when he just got beaten and, on his work, I thought he would go very close again.
"It was a no-brainer to put Lee on once Chris was unavailable as he had ridden him to win before for us."
In 2016, Johnson was given an eight-week suspension after a positive cannabis test at the Rangiora trials.
Johnson pled guilty at a hearing but claimed he did not knowingly use the drug and had no explanation for why he tested positive. Pitman said at the time that he felt it was likely that Johnson had been "spiked".
Johnson started his career in 1980, and despite taking seven years away from the sport from 1998-2005 has racked up 2441 wins in New Zealand - just 10 shy of David Walsh's record.
The 56-year-old has notched 18,818 New Zealand starts in his career which has stretched into a fifth decade, and his horses have won nearly $30 million in stakes in that timeframe.
He has had a quiet 2020/2021 season thus far, with his solitary win in 69 starts coming aboard Asathought at Wingatui in August.
- With NZ Racing Desk