 Threlfall played a major role in the 2007 FA Youth Cup final, firstly scoring a first-leg own-goal which put rivals Manchester United ahead.He scored in the second-leg to level the score and finished a crucial penalty kick helping the Merseyside club retain the title.He spent much of the 2007–08 season on loan at Hereford United but was only able to play 12 games as a result of an injury sustained in the FA Cup against Hartlepool.