Melbourne's young on-baller Jack Trengove is out for three AFL matches after failing to beat a charge of rough conduct.

Trengove's heavy tackle on Patrick Dangerfield during the third quarter of the match at the MCG on Sunday left the Adelaide player concussed and forced him from the field.

Trengove could have accepted a two-match ban with an early guilty plea.

The 19-year-old, who was the No.2 draft pick in 2009, will miss matches against North Melbourne, St Kilda and Carlton.

"I'm disappointed but I've got to move on now," Trengove said after the hearing on Tuesday night.

Trengove will have 325 demerit points imposed on his playing record.

The youngster argued that he didn't apply excessive force in the tackle.

Demons assistant coach Kelly O'Donnell described Trengove's technique in the tackle as almost perfect and noted the umpire did not award a free kick against him.

Melbourne's club biomechanics expert Kevin Ball said the force with which Dangerfield hit the ground was increased because the Adelaide player was making a kicking motion as he was tackled, throwing Trengove and Dangerfield off balance and quickening the Crows player's fall.

Player advocate Iain Findlay said it was a fair tackle and did not involve a slinging motion.

"It's an accident that happens," Trengove said.

"I don't intend a guy to get concussion from that sort of tackle."

Legal counsel Andrew Tinney seized on Trengove's statement that it was important to make every tackle "stick".

"This was a tackle that was simply too forceful," Tinney said.

Adelaide's medical report said Dangerfield suffered impaired cognitive function following the incident and is being monitored on a daily basis, although he is yet to be ruled out of Saturday's team to play Gold Coast.

Trengove's ban is another blow for the seventh-placed Demons who have lost Jack Grimes for the rest of the season because of a foot injury the star utility suffered in Sunday's 96-point win.

Sydney defender Ted Richards was found not guilty of a rough-conduct charge.

Richards, who was facing a one-match ban, successfully argued that his bump on Western Bulldogs utility Lindsay Gilbee was not to the head/neck area during the second quarter of Saturday's game in Canberra.

"I'm very grateful to the club for supporting me," 139-game veteran Richards said.

"I'm just very excited to be playing this week."

The eighth-placed Swans host lowly Port Adelaide at the SCG on Saturday.

Fremantle's Nathan Fyfe was due later on Tuesday night to challenge the severity of a $2400 fine for making contact with an umpire.

Fyfe's case was delayed because of technical issues with the video-link.

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