It was two years ago that Jamie Carragher offered Casemiro a rather withering piece of advice: “Leave the football before the football leaves you.” Fast forward to this season and the Brazilian’s record for Manchester United reads: nine goals (second only to Benjamin Sesko), two assists, and 2,417 minutes played in 31 starts from a total of 32 appearances, with 13 games finished, including seven of the past nine. Consider, too, how the January announcement of Casemiro’s departure from United at the end of the current campaign has led to…