"There were other races that we would have run in as opposed to the path that we've gone down.
"If he runs well tomorrow, I think we're on target. He gets the chance to run a mile and a half, which is what you like to do before you contest a two-mile race."
Sir Charles Road is on the cusp of gaining a start in the A$7 million Melbourne Cup next Tuesday, sitting 25th in order of entry for the 24-horse field.
Meanwhile, closer to home O'Sullivan has dual nominated former Hong Kong galloper Giovanni Canaletto for assignments at either Tauranga (Opn Hcp, 1300m) or Awapuni (Opn Hcp, 1400m) this weekend.
The now seven-year-old was originally prepared by Aidan O'Brien in Ireland, where he placed third in the Gr.1 Irish Derby and fourth in the Gr.1 English Derby before his sale to Hong Kong interests. Although he failed to win in six starts in Hong Kong, Giovanni Canaletto was stakes placed on three occasions, including a third placing behind star NZ-bred galloper Werther in the 2016 Hong Kong Derby.
"He will run wherever the best track is on Saturday," O'Sullivan said.
"He hasn't raced for two-and-a-half years and we haven't trialled him. He has had two bowed tendons, so he has got a lot against him.
- NZ Racing Desk