Manchester United’s two worst players in the FA Cup semi-final victory over Coventry City were both handed starts against Sheffield United. It didn’t go well. When you look back at Manchester United’s collapse against Coventry,it’s pretty easy to pinpoint where it all went wrong. The double change to take off Alejandro Garnacho and Kobbie Mainoo saw Antony and Christian Eriksen come on. Both are experienced players, however, they lacked the dynamism of the young duo and were the two weakest players on the pitch as Coventry clawed their way back into the game. READ MORE: Manchester United’s Bes…