Tarrant injured his left knee in a collision with West Coast’s Andrew Embley in the first quarter at Subiaco Oval and will be sidelined for between four and six weeks.
Losing Tarrant is a blow to the side’s top-four ambitions with important games against North Melbourne, the Sydney Swans, Hawthorn and Carlton to round out the season.
Tarrant, who was making his comeback from a heel injury against West Coast, has played 13 games this season.
Harvey said he was the type of player that could return to the side without a stint in the WAFL if the opportunity presents during this year’s finals campaign.
“He’s a player that comes up quite quickly so he doesn’t need a lot of game time,” Harvey said.
“Even today (Sunday) you saw he’d been out for that period of time but it didn’t look like he’d been out.”
