Manchester United have slipped to another Old Trafford defeat after losing 1-0 to Arsenal – and Casemiro’s role in the loss was notable. United were looking for a response after the 4-0 drubbing at Crystal Palace but just couldn’t unlock the Arsenal defence. Leandro Trossard scored the only goal of the game with United simply lacking the quality in the final third to get back into the game. The absences of Bruno Fernandes and Marcus Rashford were certainly felt as United managed just two shots on target from 14 attempts. United just couldn’t test David Raya enough and drew a second blank in th…