MELBOURNE coach Dean Bailey has flagged one or two changes for Sunday's clash against Port Adelaide at AAMI Stadium, but last year's No.1 NAB AFL Draft pick Jack Watts won't be called up.

Watts along with Sam Blease (Melbourne's priority selection at No.17 last year) are currently training with the Demons during their school holiday break. Both Watts and Blease are studying Year 12 and have been undertaking a 10-12 week training program, which is geared around their schooling and their football development.

Although they are regular faces at the club during the school holidays, Bailey is adamant the pair, especially Watts, won't be rushed in for round three.

"We're very committed to ensuring the work they've done has been good," the coach said from the Junction Oval on Wednesday.

"Jack's more advanced than what Sam is, but we're still on course to develop them. And when they're ready and they've been physically challenged and if they're good enough, they'll play.

"We won't be rushing them in."

Although Bailey did not say which players are in contention for a call-up, ruckman John Meesen, yet-to-debut midfielder Rohan Bail and tall Lynden Dunn were among the best for Casey last weekend, during the final round of VFL practice matches.

But Bailey said the likelihood of Watts debuting later in the season remains a genuine possibility.

"We expect in the second half of the year to be looking at trying to provide Jack with opportunities," he said.

"He's progressing pretty well. It will be more likely that we'll see Jack play for Melbourne in the second half of the year.

"These next two weeks are going to be great for him … he's worked really hard at school, so the carrot on the end of it was to train with us for two weeks. He was bouncing around last night." 

The second-year Melbourne coach said it was important for the coaches to see Watts and Blease training with the club at this stage of the year.

"It'll give us a chance to see them compete during training and we can actually put them in some of our major drills and we'll see what they've got," Bailey said.

Meanwhile, Bailey believes the Power, where he was an assistant coach from 2002-07, have changed playing styles since his departure.

"They seem to be zoning more. They've always been a club that's had some element of zoning about them, but they've certainly done a fair bit of zoning in the pre-season games and first couple of games," Bailey said.

"The majority of their good players are still very good. They're stars and they're very competitive blokes as well so it's going to be a tough game on the weekend.

"The stoppages and first possession clearances will tell the story and we'd like to think we're going to be competitive in that area."