Walton began his career with Leeds United, making his debut as a 16-year-old in the Championship in 2004. After 37 appearances in all competitions, he made a £500,000 move to Iain Dowie's Charlton Athletic in 2006. He failed to make an appearance for the Addicks, but spent loan spells at Cardiff and Ipswich before joining QPR for £200,00 in the summer. He fractured his fibula shortly after moving to Loftus Road so had to wait until December to make his debut. He has started once and made four substitute appearances for Rangers prior to joining City.
The 20-year-old is Phil Brown's second signing this month, with goalkeeper Mark Tyler also joining on loan in the last fortnight. John Welsh, Curtis Aspden, Will Atkinson and Ben Wilkinson have all gone out on loan, while Steve McPhee, Danny Coles and Damien Delaney have completed permanent transfers.