Swans sign duo
Britton arrives on a month's loan from West Ham while Stiens moves to Vetch Field from Leeds until the end of the season.
Both players had been on trial in South Wales for the past fortnight and will be aiming for a taste of first team action.
Midfielder Britton and striker Stiens are both awaiting their debuts for their retained clubs but have been thrust straight into the squad for Saturday's trip to fellow strugglers Exeter City.
Swans boss Brian Flynn is hoping the young pair will have a positive impact on the team during their spell at the club.
"I have no doubt at all that these two will prove to be a success whilst they are with us," Flynn told the club's official website.