Maynard was reported over a spoiling attempt in which he made late contact with GWS forward Daniel Lloyd during Sunday's pre-season fixture.
The Magpies backman made contact with the head of Lloyd, who was ruled out for the rest of the game.
The incident was assessed as careless conduct, high impact and high contact by the match review officer, resulting in a two-match ban with an early guilty plea.
If Maynard accepts the penalty, he will miss Collingwood's season opener against the Saints on March 18 and a meeting with Adelaide in round two.
In further bad news for the Magpies, recruit Nathan Kreuger has been offered a one-match suspension for.engaging in rough conduct against Giants veteran Callan Ward.
The incident-packed pre-season match has also led to GWS ruckman Braydon Preuss being offered a one-match suspension for a dangerous tackle on Pies counterpart Brodie Grundy.
If banned, Preuss will miss the Giants' season opener against cross-town rivals Sydney.
Teammates Stephen Coniglio (tripping) and Tanner Bruhn (forceful front-on contact) were offered $1000 and $2000 fines respectively for lesser offences.
Meanwhile, West Coast defender Alex Witherden can accept a one-match ban for engaging in rough conduct against Fremantle's Andrew Brayshaw in Sunday's pre-season derby.
Dockers forward Michael Walters was offered a $2000 fine for engaging in rough conduct against Eagles wingman Andrew Gaff.
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