Facing Celtic will be Brown's toughest challenge since Dons boss Derek McInnes handing him the chance to establish himself the Dons' 1-0 win against Motherwell.
Aberdeen had conceded nine times in four matches before that victory but since Brown replaced Jamie Langfield the Dons have not lost a goal in three matches.
In fact Brown, who also shut out Livingston in the League Cup, has yet to concede a goal for the Dons and will be expected to remain between the sticks for Sunday's match between the SPFL Premiership's biggest clubs at Pittodrie.
Brown had never worked under a full-time goalkeeping coach until he joined Aberdeen, and Jim Leighton's targeted training sessions may be part of the reason for his enthusiasm and effort - which has been rewarded with a first-team berth.
McInnes said: "Scott is held in high regard by everyone at the club and has been desperate to play his part. He shows that every day in training and he got his opportunity [against Motherwell].
"Sometimes goalkeepers get a bit more leeway at times and you show a bit more faith as you don't change them as quickly as outfield players. The other goalkeeper has to sit and wait for that opportunity which can be difficult but when they do get the chance to play they have to take it."