▁a ▁mid f iel der ▁for ▁Ö re bro ▁SK ▁in ▁All sv ensk an . ▁ ▁M å rt ens son ▁played ▁ 7 ▁matches ▁for ▁the ▁Swedish ▁national ▁U 2 1 s . ▁He ▁prefer ▁to ▁play ▁as ▁a ▁central ▁mid f iel der . ▁ ▁G A IS ▁During ▁his ▁career ▁at ▁G A IS , ▁he ▁first ▁came ▁from ▁the ▁third - t ier ▁club ▁Sk öv de ▁A IK ▁and , ▁therefore , ▁had ▁some ▁time ▁to ▁adapt ▁to ▁comp ete ▁at ▁a ▁higher ▁level . ▁M å rt ens son ▁progress ed ▁pretty ▁fast , ▁and ▁he ▁shortly ▁became ▁a ▁key ▁player ▁at ▁G A IS ' s ▁mid field . ▁He ▁showed ▁that ▁he ▁was ▁a ▁great ▁box ▁to ▁box ▁player ▁with ▁good ▁stam ina , ▁but ▁also ▁good ▁vision ▁for ▁the ▁game ▁that ▁worked ▁out ▁well ▁with ▁his ▁capable ▁technique . ▁Although ▁he ' s ▁quite ▁young ▁and ▁been ▁c apped ▁several ▁times ▁for ▁the ▁Swedish ▁U 2 1 ▁team , ▁he ▁is ▁a ▁bit ▁under r ated , ▁maybe ▁because ▁G A IS ▁isn ' t ▁one ▁of ▁the ▁biggest ▁clubs ▁in ▁All sv ensk an . ▁During ▁the ▁ 2 0 1 1 ▁season ▁of ▁All sv ensk an , ▁M å rt ens son ▁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 ▁FC ▁U tre cht