RKC Waalwijk Martens' improvement made
Anderlecht loan him to another club. Over a year
RKC Waalwijk wanted the 20-year-old midfielder so it signed on a year loan. Martens, both as a midfield and winger, improves tremendously in his first season. In the summer of 2005 the club bought him from Anderlecht for a three-year contract. Football journalist Johan Derksen said at that time in one of its VI -columns that Martens is a fantastic footballer and will enjoy playing for Waalwijk.
AZ In the summer of 2006, Martens moved like his compatriot
Mousa Dembélé from AZ. It was
Louis van Gaal who noticed the young talents. Martens improved even further under Van Gaal instructions. With
AZ he had a key role to the struggle for the league title. On 28 October 2007, Martens had his first injury. This severe injury kept him outside for a long time. Only in the 2008/09 season did Martens go back into the first team. He played almost every match in that season and attracted the attention of the Italian giants
Juventus. But the Belgian midfielder remained in the Netherlands and won the championship with AZ. A year later, Martens made his first appearance in the
UEFA Champions League. In April 2011, Martens was the victim of a charge from his compatriot and former teammate
Gill Swerts. On his return in August 2011, Martens immediately scored an important goal in the match against
PSV. Two weeks later, Martens was injured again. Only in December 2011, he succeeded to come back in the first team. In August 2012, after the departure of
Niklas Moisander and
Rasmus Elm, Martens became the captain of the club. Martens played the first few games of the season, but after a serious knee injury missed the rest of the season.
PAOK On 15 January 2014, Martens signed a contract with
Super League Greece team
PAOK until 30 June 2016. After a year with PAOK, Maartens signed on loan with Belgian club
Cercle Brugge for the rest of the 2014–15 season, but after the relegation of the club, he returned to PAOK. On 5 August 2015, Martens reached an agreement with PAOK to terminate his contract with the club. ==International career==