Jack Cork conceded the Swans fell way short of expectations during their 2-0 defeat at Bournemouth.
Paul Clement’s side dropped to 17th position in the top flight as this loss on the South Coast followed up the previous setback at Hull City.
The Cherries were ahead just past the half-hour mark after Benik Afobe’s shot deflected off Alfie Mawson and left Lukasz Fabianski wrongfooted.
Earlier on, the Swans had a strong appeal for a penalty turned down by referee Mike Dean after Marc Pugh’s arm appeared to block Tom Carroll’s shot.
Afobe double the lead after the break, with the Swans failing to find a way back into the game.
And Cork admitted their efforts didn’t reach the standard required.
“It was very disappointing. We didn’t play as well as we could and we are well aware of that,” said the Swans skipper.
“The first goal was unlucky because it takes a massive deflection, but after that we didn’t react well enough. In the second half we didn’t get going.
“This is another setback for us, but now we have two big home games to come after the international break. We must react positively in those matches.”