Gluščević made his debut in professional football playing with
FK Radnički Beograd in the
1990–91 Yugoslav Second League. He scored an impressive 13 goals in 25 appearances. The next year, due to the break-up of Yugoslavia, Radnički played in the
1991–92 Yugoslav First League and impressed again by scoring 15 goals in 28 appearances. Gluščević was transferred by Red Star Belgrade to
Proodeftiki F.C. of the
Beta Ethnic in 1992, but due to the club's financial constraints he went back to the Yugoslav First League's
FK Proleter Zrenjanin and helped them to qualify for the Yugoslav Cup quarterfinals. In 1994, he went to Indonesia to sign with Pelita Jaya FC and played in the AFC Champion's Cup tournament against Ilhwa Chuma from South Korea. After Pelita Jaya FC was eliminated from Champion's Cup, Dejan was loaned to
Bandung Raya of the
Liga Indonesia Premier Division, where he won the league title and finished as the league's top goalscorer with 30 goals. After scoring a hat-trick in AFC Cup of Winners Cup In 1997, he returned to rivals
Pelita Jaya to support "FA Primavera project" with young Indonesian internationals. In 1999, after Indonesian League was stopped due to political issues, he went to Singapore to sign with
Tanjong Pagar United FC of the
S.League and as a team top scorer. In 2000, he went to Canada to sign with the
Montreal Impact of the
USL A-League. He appeared in four matches and recorded two goals. After Montreal released him from his contract due to the club's financial constrains. On May 23, 2001 the
North York Astros of the
Canadian Professional Soccer League signed Gluščević In 2002, North York appointed him head coach. He managed to lead the club to the CPSL Championship finals against
Ottawa Wizards, but were defeated by a score of 2-0. In 2005, he returned to coach the Astros, and clinched them a postseason berth. The league awarded him with the CPSL Coach of the Year award. == Managerial career ==