Born in Rotherham, South Yorkshire, Brogan broke into the Rotherham squad towards the end of the 2006–07 season, soon becoming an automatic choice making 18 starts. On 30 April 2007, Brogan signed a 2-year contract with the Millers. Brogan's consistent impressive displays the following season brought him much praise and frequent Man of the Match awards. As a result, it is reported that several Premier League clubs, including Tottenham Hotspur, showed an interest in signing the player, sending scouts to watch his performances.