ST KILDA defender Jake Carlisle has been offered a two-match suspension for his late spoil that concussed Richmond spearhead Jack Riewoldt.

Match Review Officer Michael Christian on Monday charged Carlisle with striking, grading his action as careless, high impact and high contact.

Riewoldt took no further part in Saturday's game at the MCG after Carlisle hit him with a swinging right arm in a marking contest early in the first quarter.

Jack Riewoldt came off the ground after this incident involving Jake Carlisle.



Injury update brought to you by @MLC_Australia. #AFLTigersSaints pic.twitter.com/yy6gieWZNk — AFL (@AFL) May 26, 2018

Christian told reporters on Monday the fact Riewoldt appeared to have been knocked out before he hit the ground was a factor in grading Carlisle's strike as high impact.

"Certainly that look wasn't great and that was part of the reason it edged up into high impact," Christian said.

West Coast forward Willie Rioli avoided a direct referral to the Tribunal after his gentle tap on umpire Ray Chamberlain's back during Sunday's Eagles-Hawthorn game was graded as careless and warranting a $1000 fine.

He was also fined for misconduct on Blake Hardwick in the incident immediately before the umpire tap.

Willie Rioli gave away a 50m penalty for this incident with Blake Hardwick, and then appeared to make contact with umpire Ray Chamberlain.#AFLHawksEagles pic.twitter.com/O9SN0rArdn — AFL (@AFL) May 27, 2018

Christian said in deciding to grade Rioli's contact with Chamberlain as careless rather than intentional he, in consultation with AFL football operations manager Steve Hocking, had taken into account the recent Tribunal and Appeal Board hearings on umpire contact.

"I suppose in sitting down and assessing the contact the overriding factor was what has happened over recent weeks, particularly at the Tribunal and at the Appeal Board," Christian said.

"In discussion with Steve Hocking, (we decided) it was certainly prudent in this particular case to grade the case careless rather than intentional."

Christian said Rioli's case was similar to that of Carlton forward Charlie Curnow, who was cleared of making intentional contact with umpire Matt Stevic by the Appeal Board, given neither player had been looking at the umpire when they touched them.

Fremantle ruckman Aaron Sandilands escaped sanction for a bump on North Melbourne defender Sam Durdin in Sunday's game at Optus Stadium that left both players concussed, while

Aaron Sandilands and Sam Durdin both went off to the bench after this head clash.



Update thanks to @mlc_australia. #AFLFreoNorth pic.twitter.com/MYQamlQt0n — AFL (@AFL) May 27, 2018

Christian said Sandilands' initial contact with Durdin had not been high.

"Sandilands made a late decision to shepherd and made contact with his shoulder with Durdin's upper chest and then as we know (there was) an accidental clash of heads," he said.

"Both players were inconvenienced but in going through all the protocols in regard to whether it could be reasonably foreseen it was decided it couldn't (be) and therefore no charges (were) laid."

The MRO issued eight other fines from round 10's Saturday and Sunday games:

- Richmond's Dustin Martin ($1500) for misconduct against St Kilda's Jimmy Webster.

- Saint Jack Steven ($1000) for careless contact with umpire Dean Margetts.

- Tiger Shane Edwards ($3000) for striking Saint Hunter Clark.

- Brisbane's Darcy Gardiner ($1500) for misconduct against Sydney's Will Hayward.

- Essendon's Devon Smith ($2000) for rough conduct against GWS's Zac Langdon.

- Giant Dylan Buckley ($1500) for misconduct against Bomber Matt Guelfi.

- Fremantle's Brennan Cox ($2000) for rough conduct against North Melbourne's Shaun Higgins.

- Docker Bailey Banfield ($1500) for misconduct against Higgins.