[1] Previously, he spent his time in managing career at Ferencvárosi TC, FC Sopron and the Uganda and Lithuania national teams and Slovak First Division club Dunajská Streda.
He discovered players of the calibre of Marcell Jansen, Eugen Polanski and Tobias Levels during his spell as Borussia's Youth Coach.
Ferencváros were then dropped into the UEFA Cup, where they defeated Millwall and Heart of Midlothian, and earned a 1–1 draw with Feyenoord.
He lasted only a matter of months at Sopron and left to become manager of the Uganda national squad later that year.
After László's appointment as a head coach of Uganda, they missed out on qualification for the African Cup of Nations in Ghana 2008, on goal difference, in favour of Sudan.
Uganda beat rivals Nigeria and Angola for the first time in history and in December 2007, they finished third in the CECAFA Cup.
During his reign as Uganda national coach, players such Ibrahim Sekagya, Noah Kasule and David Obua managed to sign lucrative contracts abroad.
[4] Even though he was Hearts manager for only 18 months, László held the position longer than any other coach during Vladimir Romanov's ownership of the club.
He transformed Dunajská Streda into a winning team and managed to take them out of the relegation zone, in an incredible come back that saw them narrowly miss a place in the Europa League.
[11] On 29 August 2020, László was appointed manager of Indian Super League side Chennaiyin FC for 2020–21 season.
On 19 September 2022, László was appointed professional director of Liga II side FK Csíkszereda for the 2022–23 season with an optional extension.