The former Manchester City player, Adam Johnson, has been sacked by Sunderland.
A statement on the club's website said: "In light of Adam Johnson's guilty pleas, the club has today terminated his contract with immediate effect.
"The club will make no further comment."
Earlier Adidas announced it had cancelled its boot deal with the Sunderland and England player.
The 28-year-old is due to stand trial at Bradford Crown Court on Friday on two counts of sexual activity with a child under 16, which he denies.
On Wednesday he pleaded guilty to one count of sexual activity with a girl under 16 and one count of child grooming at the court.
Johnson, who has earned 12 caps for England, began his career at Middlesbrough before moving to Manchester City in 2010.
He won the Premier League and FA Cup during his time at the Etihad Stadium, and moved to Sunderland for £10 million in 2012.
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