Chelsea boss Andre Villas-Boas admitted his side had practised penalties after their Carling Cup win over Fulham.
The 10-man Blues beat the Cottagers 4-3 on penalties after their third-round clash at Stamford Bridge ended goalless after 120 minutes.
The Chelsea boss told Sky Sports News: "We practised penalties like any other manager does in football and I think our series (of spot-kicks) was good today.
"Apparently it has been, I think, seven or eight times that Chelsea didn't go through or didn't get a win on penalties and it (penalties) happened today.
"It also apparently happened that with 10 men normally we don't go through in the Carling Cup and we did today."
He confirmed Daniel Sturridge and Petr Cech, who had to come off injured in the victory, should be okay, but he is unsure if Didier Drogba will be able to start against Swansea at the weekend.
"Well we have to make a decision, I mean we wanted of course to introduce Didier in the game if we had the chance in some later stages.
"It just didn't happen today because of the limitations that we had in the things that we had to do."