Specific heat and high-field magnetization measurements on Ce-x(LacY1-c)(1-x)Ru2Si2 (c = 1, 0.8, 0.65, 0.5, 0.35, 0) are presented. Kondo type fluctuations are present in the whole (x, c) range of the ternary (Ce-La-Y) Ru2Si2 system. From the evolution of the physical properties four regions are recognized on the borders of the ternary diagram: a narrow La-rich (LacY1-c) antiferromagnetic region, a small Ce-rich area covering the whole c range where the alloys show a metamagnetic-like transition, a Y-rich region with IV characteristics and an extended (LacY1-c) and Ce-poor domain with the Ce Kondo impurity character.