Question: Willie McKay is a British football agent of many top level footballers, who is the client that plays as a striker for A-League club in Melbourne City?

Context paragraphs:
Graham Arnold: Graham James Arnold (born 3 August 1963 in Sydney, New South Wales) is a former football (soccer) player, manager of A-League club Sydney FC.  Arnold was appointed to work as an assistant coach of the Australian national football team in 2000.  After head coach Frank Farina was sacked in 2005, Arnold worked with Guus Hiddink for the 2006 FIFA World Cup campaign, in which they made the second round of the finals.  After Hiddink left, he became acting coach of the Socceroos.  Arnold went on take the manager role at A-League club the Central Coast Mariners between 2010 and 2013, where he guided the club to two premierships and a championship.  He is a member of the Football Federation Australia Football Hall of Fame.  He has now also won with Sydney FC in 2016-2017 season in the a league.

Willie McKay: Willie McKay is a British football agent based in Monaco.  He is the agent of many top-level footballers, mainly based in England and France specifically the Premier League.  His clients include James McFadden, Joey Barton, Henri Camara, Scott McDonald, Jean-Joël Perrier-Doumbé, Charles N'Zogbia, Tyrone Mears, Amdy Faye, Ross McCormack, and Pascal Chimbonda.  He is also the agent of his twin sons, Jack and Paul McKay.

Ross McCormack: Ross McCormack (born 18 August 1986) is a Scottish professional footballer who plays as a striker for A-League club Melbourne City on loan from English club Aston Villa and the Scotland national team.

Sydney FC: Sydney Football Club , commonly known as Sydney FC, is an Australian professional soccer club based in Sydney, New South Wales.  It competes in the country's premier competition, the A-League, under licence from Football Federation Australia.  The club has won three A-League Championships (in 2006, 2010 and 2017) and two Premierships (2009–10 and 2016–17) and is the only A-League club to have won the OFC Champions League (in 2005).  Since 2006, A-League teams have competed in the AFC Champions League.  Sydney FC have participated in the group stage of the AFC Champions League three times, previously; in 2007, 2011 and 2016, qualifying for the knock-out phase of the tournament once and will return to the Asian Champions League in 2018.  Having won titles in the W-League and in the National Youth League Sydney hold the distinction of being the only club to have won the A-League alongside its two affiliated competitions.

Luke Brattan: Nathan Luke Brattan (born 8 March 1990) is an Australian professional football player who plays for A-League club Melbourne City, on loan from Premier League club Manchester City.

Tim Cahill: Timothy Filiga "Tim" Cahill ( ; born 6 December 1979) is an Australian professional footballer who plays for A-League club Melbourne City and the Australian national team.  Prior to joining Melbourne City, he played for Millwall, Everton, the New York Red Bulls, Shanghai Shenhua, and Hangzhou Greentown.  Cahill plays as an attacking midfielder, but has also played as a forward on several occasions.  A box-to-box midfielder, Cahill has become recognised for "his aggressive and powerful approach and his ability to head the ball in the penalty area."

Newcastle Jets FC: Newcastle United Jets Football Club, commonly known as Newcastle Jets, is an Australian professional soccer club based in Newcastle, New South Wales.  It competes in the country's premier competition, the A-League, under licence from Football Federation Australia (FFA).  The club was formed in 2000 when it joined the National Soccer League (NSL) and was one of only three former NSL clubs to join in the formation of the A-League.  Newcastle Jets have won one A-League championship, after defeating rivals Central Coast Mariners 1–0 in the 2008 A-League Grand Final.  In 2009, Newcastle competed in the AFC Champions League for the first time, reaching the Round of 16.  In May 2015, FFA revoked Newcastle's licence after owner Nathan Tinkler placed the club into voluntary administration.  A new A-League club will be formed for the 2015–16 season, under the same name and colours.  Since its establishment, the Newcastle Jets has had a reputation for signing high-profile players.  Notable players who have represented the club include Emile Heskey, Kew Jaliens, Mário Jardel, Michael Bridges, Ned Zelić, Paul Okon, Francis Jeffers, David Carney, Joel Griffiths, and Ronald Vargas

Melbourne City FC (W-League): Melbourne City FC, also known as the Melbourne City Women, represents Melbourne City in the W-League, the top division women's football (soccer) league in Australia.  Founded in 2015, the club has its training and administration based at the City Football Academy in Melbourne and plays home games at both the CB Smith Reserve in the northern suburb of Fawkner and at AAMI Park near the Melbourne city centre.  The head coach of the team is player Jess Fishlock.

Northbridge FC: Northbridge Football Club (known as North Shore Mariners) is an Australian semi-professional association football club based in suburb of Northbridge, Sydney, New South Wales.  Founded in 1952, the club currently competes in the National Premier Leagues NSW 2, with matches played at Northbridge Oval.  Northbridge is Australia’s largest community club with over 2,500 register players.  The club has a youth development academy partnership with A-League club Central Coast Mariners with the teams playing at Northbridge now known as the North Shore Mariners.  The partnership allows players from Central Coast Mariners to be loaned to Northbridge FC for playing experience while it also allows promising players coming through the academy to easily get trials with the A-League Club.

Matt McKay: Matthew Graham "Matt" McKay (born 11 January 1983) is an Australian professional footballer who plays for Australian A-League club Brisbane Roar, and the Australian national team.  McKay played for Brisbane Roar since their first season in the A-League, and was their club captain.  His most successful season, on both the club scale and at international level, came in the 2010–11 season, in which he led Brisbane to their first ever A-League championship and premiership, and also played an integral role in Australia's second placing in the 2011 AFC Asian Cup.  He was also part of the Australian squad at the 2014 World Cup and 2015 AFC Asian Cup.

Supporting paragraphs: Willie McKay Ross McCormack
Answer: Ross McCormack