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In this work we investigate Ising and classical Heisenberg models for two andthree dimensional lattices in presence of diluted ferromagnetic dimers. Forsuch models the Curie temperature as a function of ratio of intra-dimerexchange coupling constant I_A and other inter-site coupling constants I_B iscalculated. In case dimer is treated exactly and environment within themean-field approach it was found that even for I_A/I_B\to\infty T_C remainsfinite. Similar analysis is proposed for rhombohedral phase of intermetalliccompound Gd2Fe17 where so-called Fe1-Fe1 "dumbbell" forms the dilutedferromagnetic dimer. It was shown that for such complex magnetic systems T_C isdetermined by all variety of exchange interactions and for the interval 0 <I_A/I_B < \infty T_C changes are not more than +/-10%.

Limited influence of diluted ferromagnetic dimers on Curie temperature in complex magnetic systems