Alan Edward Knight was born on 1961-07-03 in Balham, London. He attended Ernest Bevin School in Tooting. In July 1975, aged 14, he arrived at Portsmouth Football Club as an apprentice; Age UK Portsmouth notes he signed professional terms on his 16th birthday in 1977. On the final day of the 1977-78 season he kept a clean sheet in a 2-0 Third Division win against Rotherham United, with Pompey's relegation already confirmed. He was still a teenager. For the next few seasons he was mostly reserve to Peter Mellor, then established himself as first choice in 1981-82 and was named fans' player of the season for the first time.
What followed was one of English football's great one-club careers. Knight made 801 appearances for Portsmouth between 1978 and 2000 (683 in the league), the record for a goalkeeper at a single English club, surpassing Peter Bonetti's Chelsea mark. He is the second-longest serving Pompey player behind Jimmy Dickinson, and the only player to appear for the club in four different decades. He helped win the Third Division title in 1982-83, earned promotion to the First Division in 1986-87 (so he played for Pompey in all four Football League divisions), and reached the FA Cup semi-final in 1992, losing to Liverpool on penalties after the tie could not be settled across 240 minutes. In 1995 his testimonial against Southampton at Fratton Park drew about 18,000; Southampton won 5-1, but Knight scored Pompey's only goal from the penalty spot. His last match was on 2000-01-03 at Norwich City, aged 38. He had two England under-21 caps (Greece at Fratton Park on 1983-03-29; Hungary at St James' Park on 1983-04-26) and never won a full England cap.
After playing he coached goalkeepers at Portsmouth, FC Dallas (under former teammate Colin Clarke), AFC Bournemouth, Havant & Waterlooville, Dorchester Town and Aldershot, managed Dorchester Town, and was briefly joint manager at Horndean. He returned as Pompey's goalkeeping coach in January 2013 and later served as club ambassador, local media columnist and Express FM pundit. His autobiography Legend was published in September 2003 by Legendary Publishing. He received an honorary Master of Science from the University of Portsmouth in 1996 and an MBE in the 2001 New Year Honours. In 2017 he became a patron of Age UK Portsmouth.
He spoke openly about alcohol addiction and depression. Neil Allen (The News) reported that 28 days at the Sporting Chance Clinic in September 2008, funded with PFA support after his family intervened, helped save his life; by 2026 Allen wrote that Knight had been sober for 17 years. He married Heather in July 2010 (his second marriage) and settled in Clanfield. They have daughters Jade and Rebekah. In October 2024 he publicly disclosed a prostate cancer diagnosis to encourage men to get tested. A Fratton Park charity match on 2025-05-05 (Alan Knight XI vs Pompey Legends, 8-8 before 6,012) raised more than £42,000 for PCaSO, Prostate Cancer UK and the Barry Kilby Prostate Cancer Appeal. That day he also received a club presentation marking his 801 appearances and the Freedom of the City; the Freedom was resolved by Portsmouth City Council on 2025-03-18 and formally celebrated at the Guildhall mayor-making on 2025-05-13.
Knight died on 2026-09-01, aged 65. Portsmouth FC's statement said the word legend is often overused, but that he was still known as The Legend more than 20 years after hanging up his gloves. Captain Marlon Pack wrote: "RIP Knightsie. A true club legend who bled blue." Fans called for a statue or a stand in his name. A minute's applause and other tributes were planned for Pompey's Fratton Park match against Cardiff. An Evening with Portsmouth Legends Live is scheduled for 2026-11-12 at the Kings Theatre, Portsmouth, with Knight originally billed among the panel; after his death, coverage indicated the evening would serve as a celebration of his life and legacy.