Hill, alongside ruckman Aaron Sandilands, was the star performer in Fremantle's first competitive hit-out of the season displaying the pace and poise that made him a No.3 draft pick last November.
Harvey was impressed enough to compare the 18-year-old to Essendon champion Michael Long.
"He reminds me of some great aboriginal players that I've seen," Harvey said after the session. "Michael Long, actually. I'm only saying he looks like him I'm not saying he's as good as Michael.
"He's got that elusiveness about him and he brings other players into the game too, [which is] a really good trait to have as a young player.
"Make no mistake, he'll play in two weeks against Richmond. He'll probably come off the bench, and hopefully he has the same impact that he did tonight.
"He's still got to develop in his body and you don't want to play them too early when physically they're not there. But he seems to be able to get around that."
Harvey gave Fremantle supporters a glimpse of the future in the practice match playing Hill alongside Sandilands and prime midfielder Rhys Palmer in the centre square for periods.
The coach said he was still working on midfield combinations as he weighs up how to best use captain Matthew Pavlich and midfield specialist Paul Hasleby, who made a drama-free return from a knee reconstruction last night.
"We're still trying to settle our midfield," Harvey said. "It'd be fair to say you need 12-14 players who can play through there regularly throughout the course of a game.
"There's a changing of the guard in the midfield.
"We want to be unpredictable and have the same impact in those areas, not just solely rely on a guy like Pavlich.
"It just depends on whether we can hold [the midfield] without him, so he can play forward. If we can pinch-hit Pav in and around the midfield that's what we'll do."
Harvey said Chris Tarrant, who has also been tagged for a midfield role in 2009, was two to three weeks away from playing competitively as he builds his fitness.
Versatile recruit Hayden Ballantyne will miss the NAB Cup campaign after wrist surgery but Harvey said young ruckmen Zac Clarke and Brent Connelly may get a chance in the pre-season competition.
"It's a good opportunity to have a look at our list during the NAB Cup. Basically we've got to find out about our younger players and where they're at," Harvey said.
