▁Cup ▁three ▁times , ▁making ▁them ▁the ▁most ▁successful ▁reserve ▁squad ▁in ▁the ▁Netherlands . ▁By ▁winning ▁the ▁Bel o ften ▁E red iv isie ▁title , ▁J ong ▁Ajax ▁were ▁able ▁to ▁qual ify ▁for ▁the ▁actual ▁K N VB ▁Cup , ▁even ▁adv ancing ▁to ▁the ▁semi - final s ▁on ▁three ▁occasions . ▁Their ▁best ▁result ▁in ▁the ▁Dutch ▁Cup ▁was ▁under ▁manager ▁Jan ▁Ol de ▁R ie ker ink ▁in ▁ 2 0 0 1 – 0 2 , ▁when ▁a ▁semi - final ▁loss ▁to ▁FC ▁U tre cht ▁in ▁a ▁Pen alty ▁shoot - out ▁after ▁extra ▁time , ▁which ▁saw ▁U tre cht ▁advance , ▁and ▁thus ▁prevent ing ▁an ▁Ajax ▁vs . ▁J ong ▁Ajax ▁Dutch ▁Cup ▁final . ▁ ▁The ▁ 2 0 1 3 – 1 4 ▁season ▁marked ▁the ▁Jup iler ▁League ▁debut ▁of ▁the ▁A FC ▁Ajax ▁res erves ' ▁squad ▁J ong ▁Ajax . ▁Pre viously ▁playing ▁in ▁the ▁Bel o ften ▁E red iv isie ▁( a ▁separate ▁league ▁for ▁reserve ▁teams , ▁not ▁included ▁in ▁the ▁Dutch ▁professional ▁or ▁amateur ▁league ▁structure ) ▁players ▁were ▁allowed ▁to ▁move ▁around ▁freely ▁between ▁the ▁reserve ▁team ▁and ▁the ▁first ▁team ▁during ▁the ▁course ▁of ▁the ▁season . ▁This ▁is ▁no ▁longer ▁the ▁case ▁as ▁J ong ▁Ajax ▁now ▁registers ▁and ▁fields ▁a ▁separate ▁squad ▁from ▁that ▁of ▁Ajax ▁first ▁team ▁for ▁the ▁E er ste ▁Div isie , ▁the ▁second ▁tier ▁of ▁professional ▁football ▁in ▁the ▁Netherlands . ▁Their ▁home