The Wales international admitted that the Swans were not on top form, but insisted they should have taken three points from the game.
"We are massively disappointed to be honest. We were not at our best, but in the second half we ground them down," Sky Sports News quotes him as saying.
"They gave it everything today. There is always a chance at 1-0. If we play to our top level then there are not many teams who can cope with us. That at the end is a sucker punch.
"You have to be strong and hold out. We switched off for 10 seconds, and that happened. It is not easy to say it is positive now. It should have been another win for us."
Swansea remain top of Group A following the draw, with seven points from their three games played.