Goals in each half from Darren Pratley and Stephen Dobbie gave the Swans a fully-deserved 2-0 victory.
Jackett said: "We were beaten by the better side - it's as simple as that. We just couldn't really get going and that's a bit disappointing.
"We had a couple of chances in the second half through James Henry and Hamer Bouazza but I was just waiting for us to get our game going and it didn't happen.
"We didn't play how I know we can and Swansea need to take credit for that because they held us off very well and got their goals.
"We couldn't bring our key players into the game."
Source: PA
Source: PA