After the good campaign in the Copa São Paulo de Futebol Júnior coach Vanderlei Luxemburgo gave him a chance to train in the pre-season preparation with the professional team to fill the void left by Ronaldinho. He debuted in a friendly match against Londrina at Estádio do Café on 9 February 2011. He spent little time training with the professional team as he was selected to play with the Brazil U-17 team in the 2011 South American Under-17 Football Championship, being champion.
A few months later he was again selected to play in the Brazil U-17 team, but this at a higher level in the 2011 FIFA U-17 World Cup. During the competition he was linked with Manchester United. On 1 July 2012, Adryan played his first game for the Brazilian Série A, against Atlético Goianiense, and he scored in the 3–2 Flamengo victory. On 16 September 2012 he scored a freekick at the age of 16 for the Flamengo first team to help earn Flamengo a draw against Grêmio.
Adryan was a key player for Brazil U-17 team in the 2011 South American Under-17 Football Championship victorious campaign. He played eight matches and scored three goals in the tournament and finished as champion.
The young player has been called up by coach Émerson Ávila alongside Lucas Piazón as the biggest stars of Brazil U-17 team in the 2011 FIFA U-17 World Cup. On 23 June 2011 Adryan scored the winning goal against Australia U-17 with a fine free-kick. On 26 June 2011 he scored the equaliser in the 90th minute to level Brazil U-17 with Ivory Coast U-17.