In Slovakia he continued working towards the development of the country's banking sector and at the beginning of the 21st century Valach held the position of the Director of the Slovak Bank Association, which contributed to his position as an expert on Slovak economy.
Na Slovensku sa aj naďalej venoval rozvoju bankového sektora a začiatkom 21. storočia zastával pozíciu riaditeľa Asociácie bánk Slovenska, čo prispelo k jeho pozícii ako prominenta ekonomiky SR.