Colchester United have signed Charlton Athletic goalkeeper John Sullivan on a month's loan.

Sullivan, 24, will battle it out for the U's number one spot with Mark Cousins, after Carl Pentney joined non-league side Histon on a month's loan.

Sullivan began his career at Brighton and Hove Albion before joining Millwall and spent time on loan at Yeovil Town in the 2010-11 season.

The U's have also been linked with a loan swoop for Portsmouth centre-back Josh Thompson, as boss Joe Dunne looks to strengthen his defensive options.