Denílson played against Hoàng Anh Gia Lai in his debut match with Xi Măng Hải Phòng .
After much speculation about whether if Denílson can make his first appearance for XM.HP , on 21 June 2009 , he finally make his debut and scored a free-kick goal at the second minutes of the match against Song Lam Nghe An F.C Denilson in die V-League.
Denílson de Oliveira Araújo