LEADING players have questioned the consistency of the Match Review Panel after Port Adelaide's Jay Schulz escaped a ban for his sling tackle on Sydney Swans defender Ted Richards.

Schulz was cleared of any wrongdoing in an incident many believed was similar to Bryce Gibbs' tackle on Port Adelaide's Robbie Gray a fortnight earlier, one that cost the Carlton midfielder a two-match ban.

Both Richards and Gray were knocked unconscious in the tackles.

It comes as Carlton chief executive Steven Trigg and football boss Andrew McKay complained to AFL football operations manager Mark Evans on Monday night.

North Melbourne midfielder Jack Ziebell revealed his confusion at the two interpretations.

"I think it's a little bit confusing at the moment," Ziebell told Channel Nine.

"The way the game's going these days … the tackling is the best part of the game, the fans love it.

"In those two instances, the two tackles were very similar. I couldn't probably tell much difference. I think Bryce Gibbs is pretty stiff not to get off."

Gibbs was charged with rough conduct and for making "careless conduct with high impact to the head" while Schulz's action was deemed to have not been "unreasonable in the circumstances."

The League will undertake a review of the sling tackle in coming weeks and has not ruled out the possibility of implementing a change before the end of the season.

Brownlow medallist Dane Swan said it wasn't time to make an immediate change.

"I have no problem with Schulz getting off. As long as Bryce Gibbs got off, there needs to be some consistency.

"I think Gibbs is very unlucky. How many tackles are there a game, maybe 150? How many times has someone been knocked out from it this year, twice? The math is you would say it doesn't happen a lot.

"I would say it was play on and it's fine because it doesn't happen a lot - it's a pretty good tackle."

Gibbs is free to play this week when Carlton plays Richmond on Saturday afternoon.