The U21 side started their European championship qualification in June, with a 2-1 win away in Albania. The next competitive game will be on the 5th September  in Kecskemet, when they face Bosnia. Antal Roth's young international side will first face Malta at the Bozsik stadium on the 14th August. 

"It was a great feeling when I heard that Antal Roth had picked me for the U21 squad. I traveled to Telki, together with Roland Szolnoki, after Sunday's match with Pecs, to join up with the U21 squad. I hope that I can play well against Malta, and that the manager will count on me for the key game in September" - commented Kleinheisler to Vidi.hu.

Antal Roth has a very good opinion of the player they nickname "Scholes". "The 19 year old has already made his debut for the U21 side. He had regular football playing for the second division team Puskas Academy FC, where he was a regular starter. He also produced good performances for them. He had a good influence on me when I had the chance to see him up close. He has good ability, physical player, who I feel has a good career ahead of him."