Conor Gallagher has told ESPN he is “really excited” about playing for Atlético Madrid in his first derby with Real Madrid on Sunday, and said the atmosphere at their Metropolitano stadium is louder than what he’s used to in the Premier League. England international Gallagher, 24, joined Atlético from Chelsea this summer and has already made himself a fan favourite, scoring two goals in five LaLiga appearances. Both Atlético and…