[3][4] Montague received his maiden call into the first team squad for a League One match versus Scunthorpe United on 3 March 2007 and he remained an unused substitute during the 2–0 defeat.
[10] He replaced Thorpe in the starting lineup under new manager Andy Scott in December 2007 and held onto his place until the end of January 2008.
[12] After returning to fitness in August 2008,[13] Montague managed just two appearances during the early months of the 2008–09 season,[14] before suffering a season-ending cruciate ligament injury while training in December 2008.
[17] Montague elected to leave the club in late August 2009 and made 16 appearances and scored one goal during just over two years as a first team player at Griffin Park.
[21] After his retirement from football, Montague graduated from St Mary's University, Twickenham with Qualified Teacher Status.