Porplyzia, who has recovered from brain bruising and concussion, has nursed a shoulder injury, which will eventually require surgery, for the latter part of the season.
The classy match winner suffered another dislocation at training on Wednesday and will go into this week's all-important clash with the knowledge his shoulder will more than likely pop out again.
"It's probably no more of a risk than it has been," Craig said on Friday.
"Jason got concussed against Carlton in round 18 and dislocated his shoulder when he hit the ground. The week before that was Sydney, where he dislocated it, came off and then went back on to kick five goals.
"These so-called rules, for the want of a better word, suggest his shoulder's probably going to come out again under certain circumstances. So all Jason needs to be clear of is, if we can get the shoulder back in, the pain aspect of it afterwards and is he able to continue to perform?
"If the answer is yes, then let's continue to play with it knowing that it could come out. I think it's a huge risk, but the indications are so far that when it's come out we've been able to get it back in and he has gone on to perform pretty well.
"At the moment we'll continue to push on under those conditions."
The Crows have been decimated by injury during games three times this season, including the round 15 clash with Collingwood where both Porplyzia and Brett Burton were early casualties.
Craig said a lack of interchange rotations was something the team was equipped to deal with should Porplyzia suffer a match-ending dislocation.
"It always makes it difficult when you start losing people out of the game that can't come back on and, in particular midfielders, but we've been through it before," he said.
"We weren't able to cover it against Collingwood, and if we didn't get Porplyzia and Brett Burton injured we don't know what the result would've been. There have been some other games this year [against Port Adelaide and Carlton] where we have lost people and still got the result."
Brent Reilly, who has been restricted to just eight games this season, was one of the players to make way for the returns of Porplyzia, Vince and Kurt Tippett.
Reilly wasn't alone in performing below expectations last week and Craig said the penetrating midfielder was simply a victim of the club's significant internal competition.
"The lack on continuity this season has certainly been a disadvantage for Brent, but in the midfield there is also more internal competition now and that's what he faces," Craig said.
"Jason Porplyzia and Bernie Vince have come back into the side and both of those guys can play up forward, probably, a bit more competently than Brent can and that went against him."
