The AFL MRO has revealed its verdict on St Kilda forward Dan Butler's dangerous tackle, with Michael Christian opting to charge him with a one-game suspension.

The decision means Butler will miss St Kilda's upcoming match against Richmond.

Butler's act was deemed careless with medium impact and high contact.

The incident, which occurred during the third quarter of the Saints' win over Sydney at the SCG on Thursday night, drew plenty of attention throughout and post-game, with many predicting Butler would receive a ban due to the stringent nature of the MRO's grading.

The 2017 Richmond premiership player pinned Blakey's arm in the tackle, with the Swans defender's head making considerable contact with the turf.

Despite many anticipating a failed head injury assessment as the reason for Blakey's substitution out of the contest, Sydney coach John Longmire clarified that he was removed from the game due to a previously-identified foot issue.

It is currently unknown whether Blakey, who inked a gargantuan contract extension in the Harbour City during the week, will be fit to play next weekend for Sydney's all-important clash with the Brisbane Lions.