Chelsea manager Mauricio Pochettino was frustrated after seeing his side twice surrender the lead to draw 2-2 against bottom side Sheffield United. Thiago Silva and Noni Madueke scored either side of the break to put Chelsea 2-1 up, with Jayden Bogle scoring for the Blades just after the half-hour mark. Just when it looked as though Chelsea were on course to claim all three points, McBurnie struck in the third minute of stoppage time. Pochettino said: “It is very frustrating because when you concede in the last few minutes you feel very disappointed and frustrated because you should win the game. “We had the possession but didn’t create enough. I think in the first part of the season we were a little bit more solid. We were creating but we weren’t clinical. Now we are scoring more but we are conceding more. “The difficult thing is to find the balance. The team is not showing in the last few months the capacity to be solid. “We score goals but we are conceding. We need to be positive. We are trying to find solutions about being more solid and not conceding too much. “The process to build a team always takes time – it is not a magic thing.