U ) ▁players ▁were ▁lifted , ▁based ▁on ▁a ▁decision ▁of ▁the ▁German ▁Football ▁Association ▁( DF B ) ▁and ▁Deutsche ▁Fußball ▁Liga ▁made ▁on ▁ 2 1 ▁December ▁ 2 0 0 5 . ▁At ▁the ▁same ▁time , ▁the ▁UEFA ▁local ▁player ▁r uling ▁was ▁introduced . ▁This ▁r uling ▁st ip ul ates , ▁that ▁a ▁certain ▁number ▁of ▁locally ▁produced ▁players ▁must ▁be ▁en rolled ▁at ▁each ▁club . ▁For ▁the ▁ 2 0 0 6 – 0 7 ▁season , ▁this ▁was ▁at ▁least ▁four ▁such ▁players , ▁for ▁the ▁ 2 0 0 7 – 0 8 ▁season ▁six ▁players ▁and ▁for ▁the ▁ 2 0 0 8 – 0 9 ▁season ▁eight ▁such ▁players . ▁ ▁A ▁locally ▁produced ▁player ▁is ▁a ▁player ▁who , ▁during ▁the ▁age ▁of ▁ 1 5 – 2 1 ▁years , ▁was ▁lic ensed ▁to ▁play ▁for ▁the ▁club ▁for ▁three ▁different ▁seasons ▁or ▁years . ▁ ▁Rat io ▁of ▁foreign ▁players ▁Data ▁from ▁season ▁ 2 0 0 9 – 1 0 . ▁ ▁Count ries ▁With ▁ 4 2 ▁players , ▁Brazil ▁is ▁the ▁country ▁with ▁the ▁most ▁national s ▁playing ▁in ▁the ▁German ▁professional ▁football ▁le agues . ▁Th irty ▁of ▁them ▁played ▁for ▁clubs ▁in ▁the ▁highest ▁level ▁in ▁ 2 0 0 9 – 1 0 . ▁Only ▁four ▁clubs ▁in ▁the ▁ 1 . ▁Bundes liga ▁were ▁totally ▁without ▁Brazil ian ▁players : ▁V f L ▁Bo ch um , ▁SC ▁Fre ib urg