St Kilda tagger Steven Baker has been suspended for seven matches by the AFL Tribunal.

Baker was found guilty of engaging in rough conduct against Fremantle's Jeff Farmer during the third quarter of Saturday's match at Telstra Dome.

The tribunal jury accepted Baker's account of events, with the player saying he was running in front of Farmer, before stopping and propping causing Farmer to run into the back of him.

But they still found he had engaged in rough conduct, acting recklessly and that he made high contact to Farmer with high impact.

The incident, which was not captured on television footage, was referred to the tribunal after an investigation by AFL investigations officer Graeme McDonald.

The investigation was instigated after Farmer was left concussed and bloodied by the collision.

Baker's previous poor record at the tribunal increased the severity of his penalty, without which he would have received a four match ban.

But he received a 40 per cent loading for previous suspensions totalling four matches in the past two seasons, as well as 127.5 demerit points carried over.

The penalty will end Baker's season regardless of whether the Saints make it to the grand final and will extend into next season.

Saints football operations manager Ken Sheldon said the club will consider an appeal, and it will make up its mind by Wednesday's midday deadline.

Earlier Collingwood's Ben Johnson accepted a six game suspension, which ensures his season is also over.

Johnson submitted an early guilty plea to making forceful front on contact to Melbourne's Daniel Bell at the MCG last Friday night.

Had he contested the charge at the tribunal he would have risked an eight match ban.

Brisbane Lions defender Jason Rowe accepted a one game suspension for making forceful front-on contact to Sydney's Luke Brennan at The Gabba last Saturday night.

Port Adelaide's Daniel Motlop and Hawthorn's Luke Hodge will pay $900 for wrestling each other and Geelong defender Darren Milburn will pay a $600 fine for throwing his mouthguard at the Kangaroo's Shannon Grant.

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