Luc began his professional footballing career in 1975 with the Fléron-based, Royal Star Fléron Football Club with whom he participated in the Belgian Fourth Division and later helped them in promotion to the Belgian Third Division. In 1981, he moved to Ferrières where he signed a one-year contract with Belgian Third Division club, Royale Union Sportive Ferrières.

He first moved out of Belgium in 1983 to Netherlands where he signed a two-year contract with Heerlen-based, Eerste Divisie club, Sporting Heerlen.

In 1985, he moved back to Belgium and more accurately to Vaux-sous-Chèvremont where he signed a long-term contract with along with Belgian Fifth Division club, Racing Club Vaux and in long five-year spell with the club, he helped them in promotion to the Belgian Fourth Division.

In 1990, he signed a two-year contract with Huy-based, Belgian Third Division club, Royal Football Club Huy.

In 1992, he moved to Virton where he signed a long-term contract with Belgian Fourth Division club, R.E. Virton. He first helped his side in promotion to the Belgian Third Division and later in promotion to the Belgian Second Division.

He then moved to Hasselt where in 1995, he signed a one-year contract with Belgian Second Division club, K.S.C. Hasselt.

Later, in 1996, he signed a one-year contract with UR Namur and helped his side win the 1996–97 Belgian Third Division and hence in promotion to the Belgian Second Division.

In 1998, he moved to Athus where he signed a one-year contract with Belgian Fourth Division club, Royal Sporting Club Athusien. Finally, he ended his career as a footballer in the year 2000, playing for a season with another Belgian Fourth Division club, Royal Football Club Aubel.

He began his managerial career in 1999 with Lierneux-based Belgian Fifth Division club, RUS Sartoise. In 2003, he was appointed as the head coach of another Belgian Fifth Division club, Weywertz-based, FC Weywertz. In 2004, he moved to Arlon where he signed a three-year contract with Football Club Jeunesse Lorraine Arlonaise with whom he participated in the Belgian Fourth Division and later helped them get promoted to the Belgian Third Division. Later, in 2007, he moved to Spy where he was appointed as the head coach of Belgian Fourth Division club, RFC Spy on a two-year contract. In 2009, he moved to Hamoir where he worked as the head coach of Belgian Third Division club, Royal Racing Club Hamoir and thus ending his eleven-year long-spell in Belgium as a football manager.

Luc holds the UEFA Pro Licence, the highest football coaching qualification. He received the UEFA Pro Licence in 2007 and the UEFA A License which he received on 10 September 2002, from the Royal Belgian Football Association. He is also a graduate from the Federal School of football coaching of Union Royale Belge Des Sociétés de Football Association (URBSFA). He also holds the CAF A License which he received from the Tunisian Football Federation on 5 February 2015.

He first moved out of Belgium as a football manager in 2010 to the African continent and more accurately to the Democratic Republic of the Congo where on 26 August 2010, he was appointed as the head coach of Linafoot club, AS Vita. In his very first season as the head coach of the Kinshasa-based club, he helped them win the 2010 Linafoot finishing at the top just above arch rivals, TP Mazembe and also helped his side win the 2011 Super Coupe du Congo. The Congolese club also reached the Second Round of the 2011 CAF Champions League under the leadership of the Belgian football manager. The Belgian maintained an unbeaten 23-games record with the Kinshasa-based club and later resigned from his position by April 2011.

In May 2011, he moved to another African country and this time to Gabon where on 1 July 2011, he was appointed as the head coach of Gabon Championnat National D1 club, Missile. He helped the Libreville-based club win the 2010–11 Gabon Championnat National D1, which was the first national title won in the history of the club, thus helping them qualify for the 2012 CAF Champions League and also helped his side reach the First Round of the Round of 16 of the 2011 CAF Confederation Cup where they narrowly lost 0–3 on penalties to Algeria's, JS Kabylie after the tie had ended 3–3 on aggregate. These two particular achievements are the club's best ever achievements in the respective competitions. In the 2011–12 Gabon Championnat National D1, he had also helped his side secure the 4th position, thus ending his one-year spell with the Gabonese club. He also helped a number of players from his squad earn caps for the Gabon national football team, one of whom later signed a two-year contract with Russian Football Premier League club, FC Rostov.

In June 2012, he moved to Algeria where he was appointed as the head coach of Algerian Ligue Professionnelle 1 club, MC Oran on a one-year-term contract. Later, in September 2012, due to some financial delays he decided to part company with the Oran-based club.

In April 2013, he moved to Kenya where he signed a short-term contract with Kenyan Premier League club, A.F.C. Leopards. He took charge of the club in April 2013 when the club was struggling at the bottom of the table to avoid relegation to the Kenyan National Super League but by August 2014, the Belgian football manager helped the Nairobi-based club secure the 2nd position in the 2013 Kenyan Premier League, thus helping them qualify for the 2014 CAF Confederation Cup and also helped them win the 2013 FKF President's Cup.

In July 2014, he moved to Tunisia where he was appointed as the head coach of Tunisian Ligue Professionnelle 1 club, JS Kairouan. He helped his side secure the 8th position in the 2013–14 Tunisian Ligue Professionnelle 1 which was the club's best ever performance in the top division of the Tunisia in the past ten years.

On 21 December 2015, he again made a move to North Africa and this time to Sudan where on 23 December 2015, he signed a one-year contract with African giants, Al-Merrikh SC. He began his 2016 Sudan Premier League campaign on 27 January 2016 with a 2–0 win over Merrikh Kosti at the Al-Merrikh Stadium. He helped the Sudanese side qualify for the Second Round of the 2016 CAF Champions League where they narrowly lost on aggregate to Algerian side, ES Sétif. His side was narrowly eliminated on a 2-1 aggregate in the Play-off round of the 2016 CAF Confederation Cup by Moroccan side, Kawkab Marrakech. In all the competitions played by the Sudanese club under the Belgian manager, they managed to win 17 games and played out 3 draws in a total of 22 ties.

Luc Eymael spent eight months working in Polokwane City, he found it struggling and every year lamenting at the bottom halve of the league (precisely between position 16 and 14) fighting relegation battle. The Belgian tactician joined Rise and Shine at the start of the season (2016/2017), helped Polokwane city to end the first half of the campaign in fifth position in the league, the first time the club has reached that high, which made them title hopefuls.He then resigned with rumours citing he is going to join Bloemfontein celtic

On 24 August 2017, Eymael joined South African Premier Soccer League club Free State Stars, taking over from Sammy Troughton.