Will Grigg played 80 minutes as MK Dons climbed up to second in Sky Bet League One after a 1-0 win away at Colchester United.
Dele Alli scored the only goal of the game a minute before the break to secure the win away at the League One strugglers.
The win leapfrogged Karl Robinson's side over Swindon Town and up to second in the table, five points behind the league leaders Bristol City.
Will has made 24 league starts for The Dons in a season long loan spell from The Bees, scoring nine goals.
Will was the only player in competitive action this week but Mark Smith played 90 minutes as Hampton and Richmond Borough drew 1-1 with a young Brentford XI on Tuesday evening.