The Welsh outfit were two-goal winners over the European Champions in the first leg and are therefore just 90 minutes away from their first ever appearance in a major cup final.
The Swans enter the match having lost just one of their last nine games in all competitions, while they have not been beaten at home since December 8, one of just two home defeats all season.
The opening goal could prove decisive this evening with Michael Laudrup's side yet to lose a game in which they have scored the first goal. Should they progress then they will face Bradford City in the final.
Chelsea, meanwhile, have won each of their last six away games in all competitions and have conceded just 11 goals on their travels in the entire campaign. The Blues have failed to beat Swansea in Wales since 1983, however, with their two most recent visits ending in 1-1 draws.
Swansea are expected to continue with the same side that won the opening leg, but Chico is a doubt and therefore Garry Monk could start. Chelsea, meanwhile, are not expected to risk David Luiz, meaning that Gary Cahill will continue in the centre of defence.
Swansea: Tremmel; Rangel, Monk, Williams, Davies; Ki, Britton; Hernandez, De Guzman, Routledge; Michu
Chelsea: Cech; Azpilicueta, Ivanovic, Cahill, Cole; Ramires, Lampard; Oscar, Mata, Hazard; Torres
Sports Mole says: 2-2