Signed on loan from Portsmouth for the remainder of the 2013/14 campaign, John brings Football League experience to the United squad following his arrival at the R Costings Abbey Stadium in early January.
A product of the Brighton & Hove Albion youth system, this 25-year old played 13 games on the south coast prior to joining Millwall in 2009. Subsequently loaned to Yeovil then Charlton Athletic, John eventually signed for the latter during 2011, but soon found himself despatched on further temporary deals to both Colchester and AFC Wimbledon.
He helped the Dons successfully avoid relegation at the end of last season, before Portsmouth snapped up the 6'2' stopper on a two-year deal in May 2013. He was first choice at Fratton Park at the beginning of the current campaign, playing seven games until falling out of favour at troubled Pompey.