The coach has also labelled key defender Marcus Drum a required player at Fremantle after an eye-catching end to the 22-year-old's season.
It has been reported that Tarrant, who turns 29 this month and is entering the final year of a four-year deal with Fremantle, is exploring a possible return to Victoria.
But Harvey said the converted full-back would be playing at Fremantle next season, and any plans Tarrant may have to return to his home state at the end of his contract would not change the club's position.
"He's contracted to Fremantle and he will be playing at Fremantle next year," Harvey told afl.com.au.
"When you commit to a four-year contract you commit to a four-year contract. He won't be playing for any other club next year."
After 161 games with Collingwood, Tarrant was traded to Fremantle at the end of the 2006 season. He led the Pies' goal-kicking between 2001-2005 but his career as a forward stalled at Fremantle.
The former spearhead was sent to full-back this season and was in contention for All-Australian selection halfway through the year after negating elite forwards Brendan Fevola, Mark LeCras, Brad Johnson, Lance Franklin and Cameron Mooney.
Harvey said he hoped Tarrant appreciated "the new lease on life" the club had given him in 2009.
"There's been a lot the club's done for Chris Tarrant to get him here and to keep him here, and he will be playing the length of his contract," Harvey said.
"I'd like to think that Chris understands the coaches have found him a new lease on life. He needs to understand that."
Drum, who is out of contract, played just five games for Fremantle this season, but his last month was accomplished.
The key defender was dropped after round one and a series of back and hamstring related injuries hampered his preparation for periods.
Harvey said the future of the young Victorian, who was recruited by Fremantle with pick No.10 in the 2005 NAB AFL Draft, would be reviewed this week.
"He's a required player and if other clubs want to talk about him that's up to them," he said.
"He has had a good last month. He's had to battle some injuries this year and sometimes it takes players longer to get back on track and be ready for selection.
"That's what's happened for him this year.
"He's capable of holding down a key defensive position."
