Jonker is in "great" shape according to his trainer Tony Gollan as he prepares for a first-up outing in the Oakleigh Plate on 26th February.
Gollan's star sprinter is currently priced as a 16/1 chance for the Group 1 contest over 1100 metres and was last seen when winning the Manikato Stakes on October 22.
The son of Spirit Of Boom is still an entire and has been under Gollan's care for over a year now, with that latest win being the biggest of his career to date.
"He's come back great," Gollan told Racing.com. "He had enough time off to get over the spring and he's prepped up well. He'll have a really good foundation on him for his first-up run.
"I just can't really be more happy with the way he's going the horse, obviously, each preparation I've known the horse a little bit better now, had him for that little bit longer.
"I'm sure he's in for a good autumn and early winter."
The six-year-old returned when winning a jump-out on Tuesday morning at Doomben and is set to trial again before heading to Melbourne for his first two outings of the new campaign.
"He'll trial again in a fortnight, then he'll go to the Oakleigh Plate first-up and then to the William Reid, Moonee Valley again over the 1200 metres," Gollan added.
"From there, more than likely, we'll just wait until we get to the Doomben 10,000 and Kingsford Smith."