After passing the jail term, the judge orderered Johnson to pay £50,000 of the prosecution’s £67,132 costs.
That’s less than the £60k a week Johnson was earning in his Sunderland days.
Judge Rose said: “You continued in your grooming of this girl even after you were engaged in sexual activity with her.
“You wanted no-one to know that you and she were exchanging messages.
“You asked her to find a place to meet that was private and secluded so no-one would see you in her company.
“You made a deliberate decision to engage in sexual activity with this young girl, no doubt in the expectation that you would get away with it.
“Your future as a professional footballer must be in doubt.”