The Clarets had the lead through Josh Brownhill before an own goal from Aro Muric handed the visitors a point.
Esteve said: It's very cruel. We gave so much power and energy in this game. But that's football and we'll continue to try another game.
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"We had so much opportunity to score. It's football, in another game David scores, Jacob scores. All confidence in them though, we love them, we have full confidence in the team.
Yes, Josh is a hard worker. He likes pressing and the goal is very good for the team. Josh has a very good mentality and when he enters the game, full of confidence, he gives so much power for the team. I love it."