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Coach Don Pyke flagged the possibility during the week of trying to shut down at least one star in the Swans' engine room with All-Australian trio Dan Hannebery, Josh Kennedy and Luke Parker at the top of the list.
And Mackay said his side was well equipped to lock down on a player, even though tagging isn't built into the Crows game plan, which has transformed them into the most potent attacking side this season.
"That's something that if we need to we can go to and use, and something in the kit bag that hopefully we don't have to use," Mackay said.
"With the quality they've got we may have to at some stage.
"Potentially we've probably got a number of guys that can do it. That's one of the things we've actually prided ourselves on this year is being pretty flexible group.
"You look at their midfield and it has been the benchmark for a number of years. It's a big challenge for our midfield group and I think we understand that if we can give our forwards enough opportunity then they're able to kick a score.
"It's just whether we can get it in there enough and give them good service. That will probably be the deciding fact in who wins the game."
Richard Douglas is a possible option in midfield for a run-with role while Rory Laird or even Brodie Smith could do a lockdown job.
Adelaide and Sydney clash in a final for the first time in four years on Saturday, and it's the Crows' first visit to the venue since round six of 2012, a game the visitors won by five points.
The Swans turned the tables in Adelaide later that year in week one of the finals en route to the premiership. Just eight Crows remain from the team that lost that game, and only seven Swans from that side will run out on Saturday.
Adelaide traditionally play well at the SCG having won 11 of 17 matches there, and Pyke has ensured his team will be ready for the ground's awkward dimensions by using cones at training in Adelaide this week to mark out the size of the SCG.
Pyke's team arrives in Sydney on Friday morning and will train lightly on the SCG before Saturday's game.
"One of the things this year we've been pretty good with is being able to play on every ground, play our style no matter what the dimensions of the ground are," Mackay said.
"There hasn't been one type of ground that we've struggled on or played particularly well on.
"The way that we want to play it doesn't really matter where we play. If we get the contest side of our game right then the rest of it generally flows and that really doesn't matter what the dimensions of the ground are."
