Allan, who spent last season on loan at Hertha Berlin, played his first game of pre-season and enjoyed a 45 minute run-out at the Kirkby Academy.
Brewster appeared as a second half substitute as the 17-year-old made his comeback after suffering a broken bone in his foot during the summer.
With the new Premier League 2 season starting away at Swansea City next Friday night, this was a good opportunity for U23s boss Neil Critchley to give his charges more minutes as they stepped up their fitness.
Dutch winger Bobby Adekanye went close in the first half with a curled effort that came back off the post and Cameron Brannagan fired a shot straight at the goalkeeper from close range.