Benfica are still looking for a goalkeeper to fight Vlachodimos for a place in the opening eleven.
According to ABC, Sevilla keeper Sergio Rico, who was loaned to Fulham last season, is one of the names on the Benfica list.
The 25-year-old has played more than 160 games with the Andalusian emblem over his career, but is set to leave behind Tomas Vaclik. Therefore Sevilla coach Julen Lopetegui should not object to the keeper leaving.