The Swans fell to a defeat thanks to Steven Caulker's second-half header and the manager was particularly unhappy with the manner in which his side conceded the goal.
"It ended up being disappointing, it is always that way when you lose a derby and we really wanted to win," BBC Sport quotes him as saying.
"Our plan in the first half was to control it and we did that quite well, we kept them away from any chances.
"When we wanted to bring on some players to go for the game, they scored from a set piece. We knew that they were strong from these and it's one of the only chances they had from the game."
Swansea are now 13th in the Premier League table after today's result.