Jockey Leith Innes said after the Karaka Million that 1600m would probably be Aegon's best distance but Forsman said they will test him at further.
"I think we will give him his chance to get over ground, and that will probably mean a 2000m race," Forsman said.
"We'll decide then whether we press on to a Derby distance or keep him back to mile racing."
Forsman said the team had considered heading to Melbourne for the Group 1 Australian Guineas (1600m) on February 27, but that is a less likely option.
"We've always been leaning towards Sydney with the good age group schedule they've got there. It means he can run against his own age group the whole way through."
Aegon could have one run prior to the Randwick Guineas, with the Group 2 Hobartville Stakes (1400m) on February 20 the likely option.
Likely to join Aegon in Sydney are two stablemates that ran well in Sydney last autumn, The Chosen One and Quick Thinker.
The Chosen One was runner-up in the Group 1 Sydney Cup (3200m) last year and is likely to be headed for that race again, while plans are a little more fluid for Quick Thinker, who disappointed in the Melbourne spring after having won the Group 1 Australian Derby (2400m) last year.
Meanwhile, Forsman and Baker are likely to line up Robusto and Vee Cece in the Group 3 NZ Campus of Innovation and Sport Wellington Cup (3200m) on Saturday.
Robusto will be one of the best-backed runners behind likely favourite Waisake, while Forsman said he wouldn't rule out Vee Cece either.
"We're mindful this will be Robusto's second two-mile race this preparation and we really want to get her through to the Auckland Cup, so we've raced her pretty sparingly since the New Zealand Cup," Forsman said.
"The reason we've had a go at this one is that it's probably more winnable and suitable and she'll be a very good chance.
"I'd also give Vee Cece a chance. We put the blinkers on to sharpen her up last start and she probably just over-raced, but she's been crying out for getting up over more ground on a big roomy track, and that's what the Wellington Cup is."
Also headed to Trentham is the filly Sweet Anna, who contests the Group 3 Desert Gold Stakes (1600m) after finishing behind the placegetters in the Eight Carat Classic (1600m) and Royal Stakes (2000m) at the Ellerslie Christmas carnival.
"Getting back to a mile on a left-handed track should suit her," Forsman said. - NZ Racing Desk