 For a while it looked as though Nethercott would be the long-term successor to the ageing Gary Mabbutt, but by 1998 he had fallen out of favour in the first team and was transferred to Millwall.He helped them win the Division Two title in 2001 and reach their first-ever FA Cup final in 2004, but he was loaned out to Wycombe Wanderers for the latter part of the cup final season meaning he missed out on the final itself.After the FA Cup final defeat, he signed for Wycombe Wanderers (where he scored once against Chesterfield), and later dropped into non-League football with Woking, Heybridge Swifts and Wivenhoe Town.