Ballack: Costa needs to stay calm and train well

Former Chelsea midfielder Michael Ballack says wantaway striker Diego Costa needs to be more ‘professional’ though he sympathises with the Brazilian’s situation.

“You have a contract at Chelsea and you have to do what you get paid for, which means training well - you have to stay professional,” said Ballack.

This clip was taken from 5 live Sport on Friday 18 August 2017.