Tom Heaton admitted the Clarets’ had been floored by a sucker-punch as West Bromwich Albion left Turf Moor with the points.
Burnley had 20 goal attempts to the Baggies’ eight as Sean Dyche’s men looked to follow up their opening-day win at Chelsea.
But the only effort on target all afternoon went to West Brom substitute Hal Robson-Kanu, who slotted home the 71st-minute winner before being sent off for leading with an arm as he challenged Clarets’ full-back Matt Lowton.
“I thought the performance in terms of the football we played – the mixed football – was excellent,” said Clarets’ keeper Heaton, who was beaten when Robson-Kanu gave the home defence the slip to maintain the Baggies 100 per cent start.
“We restricted them to very little and created quite a few chances.
“Unfortunately, we got done with a sucker-punch, which you always know is a possibility with West Brom and we have been done by it.
“On the one hand it’s massively frustrating and disappointing with the result, but there were a lot of the positives to take from the performance and another marker forward that we have set ourselves in terms of how we are playing.
"Sometimes in football you don't get what you deserve and this was probably one of them."
Burnley bossed the first half and were unlucky not to lead at the break.
But the Baggies are yet to concede a goal this season and hung on with 10 men as the Clarets missed late chances to earn a point and avoid a repeat of last season’s opening result at Turf Moor.
“They are a tough side to play. They make it difficult to break them down,” Heaton added.
“I thought we imposed ourselves on the game and created quite a few chances, which on a different day go in.
“We restricted them to set-pieces, which they are dangerous from, but again I thought we handled that well.
“We’re disappointed with conceding that goal. Unfortunately, we have to take it but I know once the dust settles I know there will be a lot of positives because it felt good at times and some of the football we played was excellent.
“It’s still quite raw and we’re hurting a little bit, but moving forward I think it will be a good foundation to work from.”