Question: Roman Grill is a former German football player that has turned into a player agent for which English footballer born in Calgary, Alberta, Canada?

Context paragraphs:
Robert Holzer: Robert Holzer (born 2 August 1966) is a retired German football player.  He is currently a player agent.

Owen Hargreaves: Owen Lee Hargreaves (born 20 January 1981) is an English former footballer and current television pundit for BT Sport.  Hargreaves was known as a hard-working and "solid defensive midfielder who worked tirelessly to win the ball" and provide his teammates with possession.  Born in Calgary, Alberta, Canada, Hargreaves played with Calgary Foothills as a youth before beginning his professional football career in Germany with Bayern Munich.  After seven years with the Munich side – during which time he won four German league titles and the 2000–01 UEFA Champions League – Hargreaves signed for Manchester United in 2007, winning the Premier League and UEFA Champions League in his first season.

Karl-Heinz Thielen: Karl-Heinz Thielen (born 2 April 1940) is a retired German football player.  He spent 10 seasons in the Bundesliga with 1.  FC Köln.  He also represented Germany in two friendlies.  As of February 2010, he is a player agent and represents, among others, Liam Lawrence, Juan Carlos Menseguez and Facundo Hernán Quiroga.

Michael Serr: Michael Serr (born July 14, 1962 in Landau) is a retired German football player.  He spent 7 seasons in the Bundesliga with 1.  FC Kaiserslautern.  As of February 2009, he is a player agent with his agency Pro European Sports Management GmbH, representing, among others, Florian Fromlowitz, Claudiu Niculescu, Ismaël Bouzid, Sascha Kotysch and Jan Tauer.

Roman Grill: Roman Grill (born March 1, 1966) is a German former footballer who is now a player agent.  A defender, Grill spent eleven years playing for Bayern Munich's reserve team, and made one first-team appearance, replacing Thomas Helmer in a UEFA Cup match against Benfica in December 1995.  Bayern went on to win the competition that season.  After retiring, Grill worked as a coach with Bayern's youth team, before starting his own player agency in 2006.  His clients include Owen Hargreaves, Philipp Lahm and Piotr Trochowski.

Günter Bernard: Günter Bernard (born 4 November 1939 in Schweinfurt, Germany) is a former German football player.  He is the son of Robert Bernard (10 March 1913–1990), who was a German international football player himself.

Günther Rybarczyk: Günther Rybarczyk (born 4 November 1951 in Neuötting) is a retired German football player.  He spent two seasons in the Bundesliga with FC Bayern Munich.  As of February 2009, he is a player agent.

Marcus Marin: Marcus Marin (born 13 December 1966 in Hamburg) is a German football coach and former player who currently works as player agent.

Fritz Popp: Fritz Popp (born 20 November 1940) is a retired German football player.  He spent six seasons in the Bundesliga with 1.  FC Nuremberg.  As of February 2009, he is a player agent.

Ulrik le Fevre: Ulrik le Fevre (born 25 June 1946) is a Danish former professional football player and manager, and current FIFA-licensed player agent.  He was an elegant and technical left winger, who had a fierce shot.  He played for Danish club Vejle Boldklub, German club Borussia Mönchengladbach and FC Brugge in Belgium, and won the national championship with all three clubs.  He played 37 matches and scored seven goals for the Denmark national football team.

Supporting paragraphs: Roman Grill Owen Hargreaves
Answer: Owen Hargreaves