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|Full name||Mervyn Richard Day|
|Date of birth||26 June 1955|
|Place of birth||Chelmsford, England|
|1971–1973||West Ham United|
|1973–1979||West Ham United||194||(0)|
|1992||→ Luton Town (loan)||4||(0)|
|1992||→ Sheffield United (loan)||1||(0)|
|* Senior club appearances and goals counted for the domestic league only|
Mervyn Day (born 26 June 1955 in Chelmsford, Essex) is a former professional footballer who played in the Football League as a goalkeeper for West Ham United, Leyton Orient, Aston Villa, Leeds United, Luton Town, Sheffield United and Carlisle United. He later managed Carlisle United. He was formerly chief scout at Leeds United.
He represented Essex Schools at all levels and was picked for the England Schools squad six times, though he did not play. At aged 15 Ipswich Town, Tottenham Hotspur and West Ham United sent scouts to watch Day. Ron Greenwood's West Ham United signed Day on a youth contract in July 1971.
In February 1973 he signed a professional contract with West Ham and on 29 August 1973 he made his debut in a draw against Ipswich Town. Day became the first team goalkeeper soon after. In 1975, aged 19 he became the youngest goalkeeper ever to appear in an FA Cup Final, in their victory over Fulham. He received the PFA Young Player of the Year Award that same season, the only goalkeeper to have won the award. He was tipped as the next great England goalkeeper. In 1976, he appeared in the Cup Winners' Cup Final which West Ham lost 4–2 to Anderlecht at a sold out Heysel Stadium. However, a loss of form and injuries saw him drop out of the side, and Phil Parkes' performances were good enough to keep Day out when he regained fitness.
When Eddie Gray, then manager of Leeds United, signed him in 1985, he proved to be an excellent buy and was a key figure in Billy Bremner's side in the 1987 run to the FA Cup semi-final and League play-offs. He remained first choice keeper for Howard Wilkinson, and picked up a Division 2 winners medal as promotion was finally achieved in 1990. With the re-signing of John Lukic, Day was relegated to the reserves and bench, and only made five more appearances for the first team, although he remained loyal to the club for three more seasons until he finally left Elland Road in 1993 after eight years. His final club was Carlisle United.
Management and coaching career
After retiring, he was manager of Carlisle United and lead them to promotion into Division Two & a Football League Trophy win in 1997, but left shortly after due to a falling out with the chairman, Michael Knighton, who replaced Day as manager.
He was first team coach to Alan Curbishley at Charlton Athletic for many years before he and Curbishley both left the club at the end of the 2005–06 season. On 13 December 2006, he was again named as Curbishley's number two after the former was unveiled as the new West Ham manager but left the club at the same time as Curbishley in September 2008. On 20 July 2010 he rejoined Leeds United as chief scout to work alongside technical director Gwyn Williams. He left the position as chief scout at Leeds in March 2012 and worked as a co-commentator on ESPN's coverage of the Bundesliga. In November 2012 Day was appointed Scouting and Talent Identification Manager at Brighton and Hove Albion. On 2 July 2014 was appointed head of recruitment at West Bromwich Albion. On 30 June 2015 Day left his post as head of recruitment at West Bromwich Albion after a year in the job.  Day is now International Scout at Bristol City Football Club.
- Mervyn Day at Post War English & Scottish Football League A–Z Player's Database
- "Too much too young?". BBC Sport. 20 April 2001. Retrieved 22 July 2010.
- "Mervyn Day". Westhamstats.info. 26 June 1955. Retrieved 22 July 2010.
- "Mervyn Day Returns To Leeds". Leeds United. Retrieved 22 July 2010.
- "Mervyn Day Leads Recruitment Team". www.seagulls.co.uk. Retrieved 13 November 2012.
- "West Brom make Mervyn Day head of recruitment". BBC Sport. Retrieved 1 July 2015.
- "Terry Burton and Mervyn Day depart Albion". Retrieved 1 July 2015.