John Francis O'Shea (Irish: Seán Ó Sé) (born 30 April 1981) is a professional footballer who currently plays for Manchester United.
Born in Waterford, Ireland, O'Shea signed professional forms with Manchester United at the age of 17 and had his professional debut in 1999 against Aston Villa at Villa Park in a 3-0 Football League Cup defeat.
Following loan spells at Bournemouth and Royal Antwerp he returned to Manchester and began to feature in the United first team in the 2002-03 season, demonstrating versatility by playing at left-back, right-back, centre-back and central midfield during the successful 2002-03 Premiership campaign.
In 2003-04, United were without Rio Ferdinand after he began a suspension for missing a drugs test in January, and O'Shea took over from Ferdinand in central defence, helping United reach the final of the FA Cup where they triumphed 3-0 over Millwall.
O'Shea earned his first senior cap for the Republic of Ireland on 15 August 2001, when he came on as an 84th minute substitute at home to Croatia. His debut ended in disappointment, however, when he gave away a penalty in injury time, which resulted in Ireland conceding their lead, and the game ending