Sunderland have sacked Adam Johnson's after the midfielder pleaded guilty to one count of sexual activity with a 15-year-old school girl and one charge of grooming at the Bradford crown court.
However, he denied two other counts of sexual activity with the child and is due to go on trial on Friday.
"In light of Adam Johnson's guilty pleas, the club has today terminated his contract with immediate effect," Sunderland was quoted as saying by goal.com.
The statement by the club further added that Adidas has brought an end to their sponsorship with the 28-year-old.
Johnson was initially suspended by the north-east club following his arrest on March 2 last year. However, his suspension was revoked when the bail was extended by five weeks a fortnight later.
Earlier on Thursday, Sunderland had said that Johnson would miss the Premier League clash against Manchester United amidst allegations of child sex charges against him.
Johnson started his career at Middlesbrough before moving to Manchester City and then to Sunderland for a staggering 10 million pound in 2012. He played 20 games for his current side this season.