Reds were beaten 1-0 by Championship side Charlton Athletic at the Broadfield in their latest pre-season friendly.
Danny Green scored the only goal of the game midway through the first half with a curling free kick from 25-yards.
A half time downpour made it difficult for either side to move the ball in the second half, though substitutes Nicky Adams and Gary Alexander both had chances late on for Reds.
Brewster made eight changes from the side that beat Millwall on Saturday, with Charlie Wassmer and David Hunt coming into the back four in place of Kyle McFadzean and Mark Connolly.
In midfield, Scott Davies, Scott Neilson, Shaun Cooper and Sergio Torres all came into the side, while former Crystal Palace striker Calvin Andrew partnered John Akinde in attack.
It was Neilson who had the first meaningful effort of the match, as former Red Devil Ben Hamer in the Charlton goal tipped his low drive from 25-yards behind for a corner.
Championship side Charlton were gaining a foothold in the game, and midway through the first half they were ahead.
Claude Davis fouled Danny Haynes and from the resulting free kick, Green curled the ball past Paul Jones to make it 1-0.
Neither side were able to create much in the way of clear cut chances, though Torres saw his effort from 20-yards well saved by Hamer.
As the rain lashed down at the Broadfield, neither side were able to move the ball as freely in the second half, Neilson going closest with a header from Davies’ delivery.
Brewster made eight substitutions with 20 minutes to play in the hope of getting back into the game and it almost worked immediately.
Alexander fed Adams who ran through on goal, but couldn’t quite work his feet to create the angle as his shot sailed wide.
Adams then turned provider for Alexander as his low cross was touched towards goal by the striker, only for Hamer to make a smart stop.
Reds were unable to find a way through as Charlton held on to seal a 1-0 win.
Team: Jones, Hunt (Connolly), Davis (McFadzean), Wassmer, Sadler, Davies (Akpan), Neilson (Simpson), Torres (Bulman), Cooper (Adams), Akinde (Alexander), Andrew (Clarke)