Rosenborg Ballklub is an association football club based in Trondheim, Norway.
 Twenty people have been manager of Rosenborg since 1965, when the position was created.
 Rosenborg reached the First Division (from 1992 the Norwegian Premier League) in 1967 and has played at that level ever since, except in 1978.
 Nils Arne Eggen is the club's longest-serving manager, having led the team for 22 seasons in five spurs between 1971 and 2010.
 He won the premiership in his inaugural season and has led the team for 14 of the club's 23 league-winning seasons.
 Eggen is also the one with the most matches as manager of Rosenborg with 729 matches, while Tor Røste Fossen and Jon Jönsson which is split second on the list only was in charge of the team for 89 matches.
 Erik Hamrén managed the team for 85 matches between 2008 and 2010, before he took over the Swedish national team.
 Per Joar Hansen, which lead the team for one season in 2006, has been the manager since 2013.
The 2007–08 season was Chelsea Football Club's 94th competitive season, 16th consecutive season in the Premier League, and 102nd year as a club.
 Manager José Mourinho left the club by mutual consent on 20 September 2007 following a disappointing 1–1 draw with Rosenborg and was replaced by the Israeli Avram Grant.
José Mário dos Santos Mourinho Félix, (born 26 January 1963), known as José Mourinho (] ), is a Portuguese football manager and former football player.
 He is the manager of Premier League club Manchester United.
The 2017 season is Rosenborg's 38th consecutive year in the top flight now known as Eliteserien, their 50th season in the top flight of Norwegian football and third season with Kåre Ingebrigtsen as permanent manager.
 They will participate in Eliteserien, the Cup, Mesterfinalen and the 2017–18 UEFA Champions League, entering at the Second qualifying round stage.
 They qualified for the group stage of the 2017-18 UEFA Europa League.
 This year will mark Rosenborg's 100th anniversary, an event that will be marked with the game against Lillestrøm on 20 May, one day after the 100th year anniversary.
Born in Battersea, Houseman signed professional terms with Chelsea in 1963, having played for the Chelsea Juniors.
 He made his debut for the club in the 1963–64 season in a 3–2 win over Sheffield United but made only sporadic appearances in his early years at Chelsea, with manager Tommy Docherty unconvinced by him.
 A section of the Chelsea crowd were also unconvinced by Houseman's performances, and he was often singled out for abuse throughout his time there.
 He featured in no more than twelve games per season in his first three years with Chelsea and missed out on the club's FA Cup final loss to Tottenham Hotspur in 1967.
Jørgen Skjelvik (born 5 July 1991) is a Norwegian footballer who plays for Rosenborg as a defender.
 After starting his career with the local club Stabæk, Skjelvik moved to Sweden where he played in Allsvenskan with Helsingborg and Kalmar, before he returned to Norway and joined Rosenborg in July 2013.
 He has represented Norway from under-18 to under-21 level, but was left out of the Norwegian squad for the 2013 UEFA European Under-21 Football Championship due to an injury.
The 2009 FA Cup Final was the 128th final of the world's oldest domestic football cup competition, the FA Cup.
 The final was played at Wembley Stadium in London on 30 May 2009 and marked the third time that the final has been staged at the stadium since it was rebuilt.
 The match was contested by Chelsea, who beat Arsenal 2–1 in their semi-final, and Everton who beat Manchester United 4–2 on penalties after a 0–0 draw after extra time.
 After Louis Saha opened the scoring after just 25 seconds, the fastest ever goal in an FA Cup Final, Didier Drogba equalised in the 21st minute before Frank Lampard scored the winner with 19 minutes left to play to give Chelsea their fifth FA Cup success.
Erling Meirik (born 17 December 1948) is a Norwegian former football and football executive.
 Born in Levanger, he played for Rosenborg between 1970 and 1976, being capped 134 times and scoring 14 goals.
 He was Rosenborg's top scorer in the 1970 season with five goals.
 He was later hired as president of Rosenborg.
 He withdrew as president in 1983 as a consequence of the unsuccessful hiring of Tommy Cavanagh as manager.
The 2009 FA Community Shield was the 87th FA Community Shield, an annual football match contested by the winners of the previous season's Premier League and FA Cup competitions.
 The match was contested at Wembley Stadium, London, on 9 August 2009, and contested by 2008–09 Premier League champions Manchester United, and Chelsea as the winners of the 2008–09 FA Cup, a repeat of the 2007 match.
 The game ended in a 2–2 draw – the goals coming from Nani and Wayne Rooney for Manchester United, and from Ricardo Carvalho and Frank Lampard for Chelsea – with Chelsea winning 4–1 on penalties.
Stig Inge Bjørnebye (born 11 December 1969) is the sports director of the two time "the double" champions Rosenborg Ballklub and a retired Norwegian footballer who played in Norway, England, and Denmark, most notably for Liverpool.
 His preferred position was left back, which he occupied for domestic clubs and the national team.
 Bjørnebye was appointed assistant manager of Norway in 2003, relinquishing the role three years later to succeed Tom Nordlie as manager of IK Start.

Question: What nationality is the manager who left Chelsea after a draw with Rosenborg?
Answer: Portuguese