Chelsea manager Mauricio Pochettino was not too happy with his side’s first-half performance against Preston North End yesterday. Chelsea actually managed to win the FA Cup tie 4-0 in the end, but all four of those goals came in the second half of the game. The Blues failed to score in the first 45 minutes of the match and clearly not happy with what he had seen, Mauricio Pochettino headed straight down the tunnel before the referee had even blown for half-time, according to Evening Standard journalist Nizaar Kinsella. You would have to assume that words were said before the Chelsea players ca…