Sunderland winger Adam Johnson pleaded guilty to one count of sexual activity with a child and one count of grooming at Bradford Crown Court on Wednesday.
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The 28-year-old appeared in court on the first day of his trial into allegations of child sex charges relating to incidents between December 2014 and February last year.
England international Johnson denied two other charges of sexual activity with a girl under the age of 16.
It is alleged the winger kissed a 15-year-old schoolgirl after grooming her over the internet.
Sunderland-born Johnson, who has 12 England caps to his name, moved to The Stadium of Light from Manchester City in 2012.
Johnson was initially suspended by Sunderland following his arrest and subsequent bail in March.
But, having seen his bail extended by Durham Police, Johnson was cleared to return to training later that month and has since remained in the first-team picture.
Johnson was on the scoresheet at the weekend as Sunderland drew 2-2 with Liverpool at Anfield.