"I think when any player crosses the line you test each other, and there's that battle that goes on within the game between opponents," the Carlton coach said from Princes Park on Wednesday.
"We'll do nothing outside the rules or anything like that.
"He's out there and if he's there to be tackled, he'll be tackled or spoiled just like any other player. He won't be targeted or anything like that."
Porplyzia, 23, booted five goals in Adelaide's win over the Sydney Swans just two weeks after badly dislocating his right shoulder against Collingwood.
Ratten said maintaining the momentum gained during last week's dramatic win over the Western Bulldogs was the key to victory at AAMI Stadium, with no changes likely to be made to that team.
"We've had a plan of how to play and I thought that was pretty evident on the weekend," he said after the Blues stormed back from 37 points down in the third quarter.
"You see the way Geelong moves the footy and how fast that is. I thought we did it through the first half, but we just couldn't get our kicks inside 50 right.
"In the second half we got a lot more reward; we outran the Bulldogs, we beat them in the stoppages, especially in the second half, and won that contested footy."
It was just the latest in a growing list of memorable victories for Ratten's men, and he maintains they are in a good position to reverse the round six result against the Crows after making steady progress this season.
"Is it actually that we're fit enough or is it in our state of mind? I think it's both," Ratten said.
"Our ability to believe in ourselves has grown and I think our fitness has improved.
"At the start of the year were we a little bit underdone as a group? Maybe, and I think now our players, with those come from behind wins, have really hit their straps.
"I think it's a bit of both; mentally and physically.
"In the first half last time we had about 12 shots to about six at the MCG and then they just strangled us and got a hold of us. We need to see if we can keep that flow and momentum in our game [from last week].
"They'll try to restrict us and we'll try and exploit that, but they're good on the counter-attack in the way they move the footy forward to hurt their opposition."
Ratten said his side emerged unscathed from the 28-point win over the Dogs.
