An attacking midfielder, Marcondes began his youth career with hometown club Hvidovre IF and transferred to the academy at Danish Superliga club FC Nordsjælland in 2010. He progressed through the youth ranks to win his maiden call into the first team squad for a league match versus AC Horsens on 16 July 2012 and remained an unused substitute during the 4–0 victory. Marcondes made his senior debut in the return match on 7 April 2013 and made two further appearances before the end of the 2012–13 season. Marcondes' development continued with 15 appearances during the 2013–14 season, in which he made three European appearances and scored his first senior goal, which came in a 3–1 victory over Viborg FF on 11 May 2014. Marcondes made 24 appearances during the 2014–15 season and was thereafter an established member of the first team squad. He made a career-high 31 appearances during the 2015–16 season and scored 12 goals in 26 appearances during 2016–17. In July 2017, Marcondes signed a pre-contract agreement to depart the club on 31 December 2017. He had an excellent first half of the 2017–18 season, scoring 18 goals in 20 appearances and winning the November 2017 Danish Superliga Player of the Month award. With 17 league goals, he was top scorer of the Danish Superliga at the commencement of the winter break. Marcondes finished his career at Farum Park with 119 appearances and 38 goals. He was voted the Superliga Player of the Year at the 2017 Danish Football Awards.
Brentford
On 21 July 2017, Marcondes signed a pre-contract agreement to move to England and join Championship club Brentford on a -year contract in January 2018. He moved to London in December 2017 and officially transferred to the club on 1 January 2018. Mainly used in a substitute role, Marcondes made 13 appearances in what remained of the 2017–18 season. A foot injury suffered during the 2018–19pre-season ruled Marcondes out until 24 November 2018, but he managed just three appearances before missing another three months of the season with an ankle ligament injury. He finished an injury-affected 2018–19 season with 13 appearances and no goals. After making five appearances during the first month of the 2019–20 season, personal reasons led to Marcondes' return to Denmark on loan until 31 December 2019. Five days after his return, Marcondes' first Brentford goal was enough to beat Stoke City in an FA Cup third round match.
On 2 September 2019, Marcondes joined Danish Superliga club FC Midtjylland on loan until 31 December 2019. He made 12 appearances and scored two goals during his spell.
International career
Marcondes made 43 appearances and scored 10 goals for Denmark between U17 and U21 level. He was a part of the U21 squad which exited in the group stage at the 2017 UEFA European U21 Championship. Marcondes was called into the Denmark U21 squad for the Suwon Invitational Tournament, into which the team was entered in preparation for the 2016 Summer Olympics. Despite appearing in each match and scoring one goal, he was not named in the Olympic squad.
Personal life
Marcondes was born in Hvidovre, Denmark, to a Danish father and a Brazilian mother and has one brother. His father is a jazz musician and his maternal grandfather is retired footballer Braz Camargo. At age 9, Marcondes' parents separated and he remained in Denmark to live with his father, while his mother returned to Brazil and died in 2012.
Honours
FC Midtjylland
Danish Superliga: 2019–20
Individual
Danish Football Awards Danish Superliga Player of the Year: 2017
Danish Superliga Player of the Month: November 2017
