Swansea are leading 1-0 against Chelsea at half-time after a goal by Miguel Michu at 39 minutes.
Swansea City are about to kick off against Chelsea, in their first ever League Cup semi-final. Michael Laudrup's side are 180 minutes away from Wembley - reaching the final would also be a club first in a major cup competition - with the second leg at the Liberty in two weeks' time.
The ITV Sport website has minute-by-minute updates on tonight's action from Stamford Bridge.
Swansea City manager Michael Laudrup says their two-legged tie with Chelsea is an unusual challenge as tonight's game 'is only the first half'. He says 'it's important for us to get a result [tonight] so we can play the second leg at home in front of our fans with the possibility to go through.'
Spanish winger Pablo Hernandez could return to Swansea's starting XI tonight, after recovering from a thigh injury. He's likely to line up against Chelsea's attacking fulcrum Juan Mata - a former roommate from the time they spent together at Valencia.
The first leg of the Capital One Cup semi-final is at Stamford Bridge tonight, before a return game at the Liberty Stadium on 23 January. Swansea are aiming to reach a major Wembley cup final for the first time in their history.
Swansea City manager Michael Laudrup thinks his side will benefit from playing the first leg of their Capital One Cup semi final away from home, when they meet Chelsea at Stamford Bridge tonight.
The Swans have a good home record against the reigning European Champions and have twice drawn 1-1 with the Blues at the Liberty Stadium.
However their only visit to Stamford Bridge since returning to the top-flight ended in a 4-1 defeat.
Laudrup is set to stick with stand-in goalkeeper Gerhard Tremmel for the game following his performances in the competition so far.
The German has played throughout the run to the last four, and Laudrup feels Tremmel has earned the right to keep his place ahead of Michel Vorm as Swansea chase a first appearance at a major Wembley cup final.
Angel Rangel should be available after a calf problem, while Pablo Hernandez, Ashley Williams and Michu should all return to the starting line-up at Stamford Bridge.
Chelsea interim manager Rafael Benitez has no fresh injury concerns ahead of the game and is set to name a strong side for the game.
The Blues will still be without 'keeper Petr Cech (groin) and captain John Terry (knee), while John Obi Mikel and Victor Moses are also unavailable having left for African Nations Cup duty with Nigeria.
Provisional Swansea City squad:
Vorm, Bartley, Flores, Williams, Britton, Lita, Michu, Graham, Hernandez, Dyer, Routledge, Monk, Shechter, Moore, De Guzman, Tiendalli, Rangel, Ki, Tremmel, Agustien, Gower, Richards, Davies.
Provisional Chelsea squad:
Turnbull, Hilario, Azpilicueta, Ferreira, Ivanovic, Luiz, Cahill, Cole, Bertrand, Lampard, Ramires, Mata, Oscar, Hazard, Marin, Piazon, Torres, Ba.