We believe he will be a great addition to our squad and add important competition to our goalkeeping ranks as we prepare for the challenges ahead."
Maynard-Brewer follows Connal Trueman, who joined on a free transfer 24 hours earlier. The club now has three senior goalkeepers, including Joe Lumley.
The goalkeeper department was reinforced following the departure of Pierce Charles to Manchester City and the end of Murphy Cooper's loan spell.
In addition to Charlton and Dundee United, Maynard-Brewer has had loan spells at Chelmsford City, Hampton & Richmond Borough, Dulwich Hamlet, Dover Athletic, Ross County, and Gillingham.
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Sheffield Wednesday are scheduled to play two friendly matches on Saturday against Accrington Stanley and Oldham Athletic, with Maynard-Brewer possibly featuring.
