Geelong veteran James Kelly and Collingwood's Heath Shaw have also found themselves in hot water with the MRP.
Kelly has been offered a two-match ban, while Shaw can accept one if he pleads guilty to striking Fremantle's Hayden Ballantyne in the groin.
But Sylvia has copped the heftiest penalty for his elbow on Brennan during the third quarter of the Demons' big loss to the Suns at the MCG on Sunday evening.
The incident left Brennan concussed and carried from the field on a stretcher. Sylvia was reported at the time.
The panel determined that Sylvia's contact on Brennan was head-high, reckless and of a high impact.
His poor record, which included 93.75 carry-over points, increased his penalty to 418.75 points and a four-match sanction.
But he can have the ban reduced to three games if he pleads guilty.
Kelly was cited for the heavy bump he laid on Goddard during the third quarter of the Cats' 28-point win at Etihad Stadium on Friday night.
The MRP found that the bump, which Goddard described on Twitter as a "good hit", was reckless and head-high but of low impact.
Kelly's poor record and 64.06 carry-over points, which stemmed from last year's elimination final, increased the penalty to 289.06 points and a two-match sanction.
Even with a 25 per cent discount for an early plea, the points tally remains more than 200, so the only way he can avoid a two-match suspension is to defeat the charge at the tribunal.
Kelly is set to miss this weekend's blockbuster against Collingwood at the MCG and Geelong's round nine game against Port Adelaide at AAMI Stadium.
The incident between Shaw and Ballantyne, which took place during the second quarter of the Magpies' loss to Freo on Saturday night, first came to public attention when an umpire's microphone picked up Ballantyne saying "he punched me in the nuts".
Shaw has been charged with striking Ballantyne in the groin and the MRP has rated the contact as being intentional but of low impact.
The incident has attracted a two-match suspension, but Shaw has option to accept one.
If he pleads guilty he will miss the clash with the Cats on Saturday night.
Melbourne forward Chris Dawes, Port Adelaide forward Jay Schulz, Western Bulldogs midfielder Liam Picken and Greater Western Sydney onballer Rhys Palmer were also cited for various offences.
However, all four can escape with reprimands if they lodge early guilty pleas.
The match-day report laid against Western Bulldogs defender Mark Austin for a front-on bump on North Melbourne's Leigh Adams was thrown out.
Hawthorn youngster Taylor Duryea also escaped without sanction, although his collision with Sydney Swans small forward Ben McGlynn was looked at.
According to the MRP's report, "Duryea has his arms out in a bid to smother when he makes contact with McGlynn and it was the view of the panel he had no realistic alternative way to contest the ball."
