Born in Denmark, Hübertz started his career with local club Roskilde Boldklub 1906 in the Danish 2nd Division. He moved to Danish 1st Division club BK Frem, making his Frem debut in March 2000. In January 2001, he was bought be 1st Division rivals Farum BK. He helped the club win promotion for the Danish Superliga, but following only five games in the first half of the Danish Superliga 2002-03 season, he spent six months on loan back with Frem. In the summer 2003, Hübertz moved on to Superliga club Herfølge BK. He played two full seasons with Herfølge, scoring 11 goals as Herfølge were relegated during the Danish Superliga 2004-05 season. He was then bought by Superliga club AaB. He only scored three goals in 26 league games for the team, and was replaced in the AaB squad by Rade Prica.
English adventure
Hübertz sought a new club, and eventually signed with English club Millwall in July 2006. He was very popular with the Millwall fans and was most effective when he came off the bench in the final 20 mins of a game. After a 0–2 loss to Port Vale on 24 March 2007, Port Vale chairman Bill Bratt accused Hübertz of playing a part in the melee leading to the red card given to Vale's left back Jason Talbot. The reason was that Hübertz ran over 30 yards to the referee, to say his piece about a foul on Millwall's Ryan Smith by Jason Talbot, which led to the red card. Bill Bratt called Hübertz's actions "unforgivable". Hubertz had said that he would like to extend his Millwall contract but was not wanted by Millwall manager Willie Donachie. He then joined Northampton Town on an initial 12-month deal in August 2007. Hübertz scored his first goal for the Cobblers in a 1–2 defeat at home against Yeovil Town on 25 August 2007. On 1 January 2008 in a game against his former club Millwall he was sent off after a clash with ex-teammate Neil Harris. At the end of the 2007–08 season, despite being the club's top scorer, Northampton decided not to offer Hubertz a new contract as he wanted to return to his native country.
Back in Denmark
Hübertz returned to Denmark and signed on to play for AB in the 1st Division in summer 2008. He was released from AB on the penultimate day of the 2009 summer transfer window. He signed for Superliga club FC Midtjylland on the same day, joining the club under manager Allan Kuhn whom he knew from his time at AaB. On 20 January 2010, he signed with his childhood club Roskilde in the 1st Division, now known as FC Roskilde.
