Oxford United F.C. is an English association football club originally formed in 1893 under the name Headington United.
 The club adopted its present name in 1960, and played in local Oxfordshire leagues until being elected into the Southern League in 1949.
 It was at this time the club turned professional.
 Oxford was elected into the Football League in 1962, replacing Accrington Stanley.
 Promotion to the Third Division in 1965, the club were promoted again 3 years later and enjoyed an eight-year spell in the Football League Second Division, before being relegated.
 "The U's" reached the top tier of English football in 1985 after successive promotions, where they stayed for 3 years.
 During this time United won their only piece of major silverware, the 1986 Football League Cup.
Amsterdamsche Football Club Ajax (] ), also AFC Ajax, Ajax Amsterdam or simply Ajax, is a Dutch professional football club based in Amsterdam.
 Historically, Ajax (named after the legendary Greek hero) has been the most successful club in the Netherlands, with 33 Eredivisie titles and 18 KNVB Cups.
 It has continuously played in the Eredivisie, the Dutch football top division, since its inception in 1956 and, along with Feyenoord and PSV, it is one of the country's "big three" clubs that have dominated that competition.
Darryl Edgar Hall (born August 1, 1966) is a former Grey Cup champion and all-star Canadian Football League defensive back.
 He also played 3 years in the National Football League with the Denver Broncos and San Francisco 49ers.
Božidar Senčar (1927–1987) was a Croatian football midfielder who started playing for his hometown club Dinamo Zagreb in Yugoslav First League in 1946.
 After spending a season and a half with Dinamo he was picked up by Partizan during the 1947–48 season where he spent the following three seasons, helping them win the Yugoslav championship in 1949.
 In 1950 he returned to Dinamo and won the Yugoslav Cup in 1951.
 In 1952 he left Dinamo again, this time to join their biggest Croatian rivals, Hajduk Split, with whom he reached the Yugoslav Cup final in 1953 (which Hajduk lost to BSK Belgrade 2–0).
 After two seasons at Hajduk, Senčar returned to Zagreb and joined NK Zagreb where he played a single season before joining German giants Bayern Munich for the 1956–57 season.
 His last stop was at NAC Breda where he had only three appearances in the last season of his professional career, before retiring in 1958.
Jake Gannon (born January 25, 1987) is an American former professional ice hockey defenseman who played 3 years in the St. Louis Blues and New York Islanders systems.
NAC Breda (] ), often simply known as NAC, is a Dutch professional football club, based in Breda, The Netherlands.
 NAC Breda play in the Rat Verlegh Stadium, named after their most important player, Antoon 'Rat' Verlegh.
 They play in the Dutch Eredivisie and are known by the fierce and fanatic support of their fans.
 In their history, NAC won one national title in 1921 and won one Cup in 1973.
Bob Stephenson (born February 1, 1954 in Saskatoon, Saskatchewan) is a retired Canadian professional ice hockey right winger.
 He played 3 years for the St. Francis Xavier X-Men before turning pro.
 He played in both the NHL and WHA.
 He has been the mayor of Outlook, Saskatchewan since 1998.
 He is the father of Shay Stephenson and Logan Stephenson and the uncle of Chandler Stephenson.
Brothers Union is a football club in Bangladesh.
 It is based in Gopibag, Dhaka.
 The club was founded in 1949.
 At the beginning it was a well-known cultural organization.
 In the year 1973 this club started their football activities.
 They played 3rd Division Football League in 1973 and in 1974 and promoted to 2nd Division in 1975 and also won the title in the same year and as a result this club promoted to 1st Division.
 Brothers won their first major title in the year 2004.
 Now they are playing in the top professional football league of Bangladesh which is called Bangladesh Premier League (football).
Robert Earl Walden (born March 9, 1938) was a punter with a 17-year career in professional football, 14 of which were played in the National Football League from 1964 to 1977.
 Previously, Walden had played 3 years in the Canadian Football League from 1961-1963.
 Walden was a part of the Pittsburgh Steelers' Super Bowl IX and Super Bowl X winning teams.
Ace Darl Loomis (June 12, 1928 – September 11, 2003) was a professional American football defensive back and a halfback in the National Football League who played for the Green Bay Packers.
 Loomis was drafted in the fifth round of the 1951 NFL Draft out of the University of Wisconsin–La Crosse by the Cleveland Browns.
 He played 3 years for the Packers and retired in 1953.

Question: Who was the most important player of a Dutch professional football club that Bozidar Sencar played 3 years in before his retirement?
Answer: Antoon 'Rat' Verlegh