Dunne - 23 year old left-back released by Blackpool at the end of last season, after spending time on loan at Crawley.
Mavila - 20 year old winger/full-back, released by West Ham - spent time on loan at Aldershot last season.
Martins - Not sure... though could be 23 year old forward Calaum Jahraldo-Martin of Hull City (which might explain why he may be needed by his parent club at the weekend...)