Former Sunderland and England footballer Adam Johnson has been found guilty of one count of sexual activity with a child.
The jury at Bradford Crown Court earlier cleared him on the first count of the same charge.
The 28-year-old admitted grooming a 15-year-old girl and sexual activity with the teenager, relating to kissing her in his Range Rover, but denied the two more serious charges of sexual activity with a child.
The charges arose from a meeting between Johnson and the girl in his car in Co Durham on 30 January last year.
The judge said his preliminary view was that the case falls into the category of a five year prison sentence with a range of four to ten years.
He said: "The defendant must understand there is a very high probability of a significant custodial sentence."
He granted Johnson bail until the sentencing hearing, which will be held at a later date.
Johnson admitted that he kissed a 15-year-old fan in his Range Rover but he repeatedly denied that more serious sexual activity took place.
At the beginning of his trial - almost a year after he was arrested - he pleaded guilty to sexual activity with a child relating to the kissing.
And he also admitted "grooming" the teenager as they exchanged hundreds of social media messages over a two-month period.
But he continued to deny the girl's claims that the encounter in the car last year went much further.
The jury's decision came down to a simple question of whether they could be sure the teenager was telling the truth.
Over more than two weeks, Bradford Crown Court heard how the pair began communicating at the very end of 2014 - when Johnson's partner, Stacey Flounders, was heavily pregnant with their first child.
The girl, who cannot be named for legal reasons, was a Sunderland season ticket holder and Johnson was her favourite player.
The jury was told how she was one of a group of fans who would wait for him after home games to sign autographs and have pictures taken.
Johnson told the jury that when she sent him a friend request on Facebook he recognised her from outside the ground.
After he accepted the request he began a communication which involved 834 WhatsApp messages in little more than a month before the exchanges moved on to SnapChat and were not recorded.
Among the very first messages the pair swapped, the teenager made it clear she was at school and exactly what age she was.
Johnson first met up with the teenager on 17 January last year.
Sitting in his black Range Rover, he signed two shirts, one the girl had brought and another he had with him from the last match.
After this meeting, the messages continued and pair teased each other with talk of a thank you kiss.
When they met again, on 30 January, Johnson inquired again about his "thank you kiss".
Under oath in court, Johnson said the encounter went no further than this kiss.
The teenager, giving evidence over video-link, claimed that the footballer she idolised put her hand in his groin, over his trousers.
She also said he unbuttoned her jeans, putting his hand in her pants and that she performed oral sex on him.
The jury found Johnson guilty of one count of sexual activity with a child but he was cleared of a separate charge relating to the allegation that oral sex took place.
The court heard that straight after their encounter Johnson conducted a three-way conversation on WhatsApp - flirting with the teenager while chatting to Ms Flounders about their baby daughter, who had been born just three weeks before.
The girl's parents took her to the police when rumours about what happened between her and Johnson appeared on social media at her school and she told her mother and father what had happened.