Question: Joseph "Joey" Waterhouse left what league known as an English professional league for men's association football clubs in the summer of 2007? 

Context articles: List of Premier League seasons
2016–17 Saudi Professional League
TT Pro League
2016 Nigeria Professional Football League
First Professional Football League (Bulgaria)
Premier League
2017–18 Saudi Professional League
Myanmar Premier League
Joey Waterhouse
Football in England

The Premier League is an English professional league for association football clubs.
 At the top of the English football league system, it is the country's primary football competition and is contested by 20 clubs.
 Seasons run from August to May, with teams playing 38 matches each, totalling 380 matches in the season.
 Most games are played on Saturdays and Sundays, with a few games played during weekday evenings.
The 2016–17 Saudi Professional League (also known as the Jameel League for sponsorship reasons) was the 41st season of Saudi Professional League, the top Saudi professional league for association football clubs, since its inception in 1976.
 The season started on 11 August 2016 and concluded on 4 May 2017.
The TT Pro League (formerly known as the Professional Football League) is the Trinidad and Tobago professional league for association football clubs.
 It is the country's primary football competition and serves as the top division in the Trinidad and Tobago football league system.
 Contested by ten clubs, the league is one of the world's few football leagues that does not operate on an automatic system of promotion and relegation.
 Seasons run from September to May, with teams playing 18 games each totaling 90 games in the season.
 Most games are played in the evenings of Fridays ("Super Fridays") and Saturdays ("Fiesta Saturdays"), with a few games played during weekday evenings.
 Pro League clubs also play in other competitions, such as the FA Trophy, League Cup, "TOYOTA Classic", Goal Shield, and Pro Bowl against domestic clubs from other divisions; and against clubs from other countries in the CFU Club Championship and the CONCACAF Champions League.
The 2016 Nigeria Professional Football League (referred to as the Nigerian Glo premier league for sponsorship reasons) is the 45th season of the Nigeria Premier League, the top Nigerian professional league for association football clubs, since its establishment in 1972, and the 26th since the rebranding of the league as the "Professional League".
The First Professional Football League (Bulgarian: Първа професионална футболна лига ) is a Bulgarian professional league for men's association football clubs.
 Standing at the top of the Bulgarian football league system, it serves as the country's primary football competition.
 The league determines the champion of Bulgaria and is contested by fourteen teams.
 It operates on a system of promotion and relegation with the second tier of the Bulgarian football league pyramid, the Second League.
 Known by its previous name A Group, the Bulgarian top-tier was fully restructured during the summer of 2016, when new licensing criteria were introduced.
The Premier League is an English professional league for men's association football clubs.
 At the top of the English football league system, it is the country's primary football competition.
 Contested by 20 clubs, it operates on a system of promotion and relegation with the English Football League (EFL; known as "The Football League" before 2016–17).
 Welsh clubs that compete in the English football league system can also qualify.
The 2017–18 Saudi Professional League (also known as the Jameel League for sponsorship reasons) will be the 42nd season of the Saudi Professional League, the top Saudi professional league for association football clubs, since its establishment in 1976.
 The season is scheduled to start on 10 August 2017 and finish on May 2018.
The Myanmar Premier League (since 2005 simply "Myanmar League") was the top division of Burmese football in Myanmar from 1996 to 2009.
 The league consisted of Yangon-based football clubs, made up mostly of clubs run by various government ministries plus a few private football clubs.
 Founded in 1996, the league was an attempt to reform the Burma First Division football, which consisted of all government ministry run football clubs, by allowing private football clubs.
 Nonetheless, the Yangon-based league never gained traction with Burmese fans, and has been replaced by the Myanmar National League, the country's first ever professional league since March 2009.
 Finance and Revenue was the most successful club in the history of MPL, winning a total of 11 out of 13 championships.
Joseph "Joey" Waterhouse (born 5 September 1987) is an English former footballer; he left Premier League club Wigan Athletic in the summer of 2007.
Association football is the national sport in England, where the first modern set of rules for the code were established in 1863, which were a major influence on the development of the modern Laws of the Game.
 With over 40,000 association football clubs, England has more clubs involved in the code than any other country as well as the world's first club (Sheffield F.C.), the world's oldest professional association football club (Notts County F.C), the oldest national governing body (the Football Association), the first national team, the oldest national knockout competition (the FA Cup) and the oldest national league (the English Football League).
 Today England's top domestic league, the Premier League, is one of the most popular and richest sports leagues in the world, with six of the ten richest football clubs in the world.