Career

Mårtensson has played 7 matches for Sweden U21. He likes to play as a central midfielder. During his career at, he first came from the third tier club Skövde AIK and, therefore, had some time to adapt to compete at a higher level

Mårtensson progressed pretty fast, and he shortly became a key player at "s midfield.

He showed that he was a great box to box player with good stamina, but also good vision for the game that worked out well with his capable technique. Although he"s quite young and been capped several times for the Swedish U21 team, he is a bit underrated, maybe because isn"t one of the biggest clubs in Allsvenskan.

During the 2011 season of Allsvenskan, Mårtensson had improved even more since the season before and showed that on the pitch. A bunch of European clubs were following him, with especially some sharp eyes from the Dutch club of

On 9 July 2011, both and confirmed that Mårtensson had signed a four-year contract with the Dutch side.

lieutenant was an undisclosed fee, but Mårtensson was valued at about 1.5 million Euros at that time.

Mårtensson was included in the Sweden squad for their friendly against Ivory Coast on 15 January 2015, scoring on his debut. International goal

Score and result list Sweden"s goal tally first.