The young player started to play basketball in Trinta Sports School in Moscow. He played in the VTB United Youth League since 2014 – for Dynamo-UOR, Avtodor Saratov and Samara. He was named to the Final 8 All-Tournament Teams (2016, 18), played in the Young Stars Game (2016). He also played on adult level for all mentioned teams as well as for MBA Moscow (2016-17), he appeared in VTB League and FIBA Champions League for Avtodor.
Tonoyan played for Samara last season, averaging 4.2 points, 2.1 rebounds, 1.2 assists in 11.7 minutes in 46 Superleague 1 games; 15.9 points, 7.0 rebounds, 4.8 assists, 2.5 steals, 0.6 blocked shots in 27.0 minutes in 8 VTB United Youth League games. Agasiy is a constant participant of European Championships for Russian youth squads. This year he is on the list of U20 Russian Team.
Anton Yudin, CSKA coach, Russian U20 Team head coach:
Agasiy is a big talent, first of all, offensively. He is a creative player, tall, able to play on 2-3 positions, to create withthe ball. To move onto next level he needs to improve physically, he needs special training necessary for modern basketball player. He tried himself on different teams and I am glad that he signed with CSKA, that he will play for the second team under observation of the main team coaching staff. Many things will depend on Tonoyan. I heard some opinions that he has bad working ethics but now, when we cooperate on the U20 Team, I have no complaints at all. If he had some problems, he grew up and realized what to do. His hard work, attention to his body will be deciding to move to the high-level team.