Polylactide (PLA) stereocomplexes have attracted attention due to their ability to improve the thermal stability of bioplastics. Here, we evaluate whether PLA stereocomplexes can form stable physical cross-links in blends of a multiblock copolymer with poly(l-lactide) and poly(ε-caprolactone) segments (PLLA-PCL) and a poly(d-lactide) oligomer (PDLA). Through the investigation of the strain recovery in step-cycle experiments and compliance of stress relaxation behaviour with a three-component model for the deformation of semi-crystalline polymers, PLA stereocomplexes were found to possess sufficient stability in the true strain range ε_H < 2.25 to be described as firm physical netpoints at 70 °C in the studied blends with PLA stereocomplex content φ_{c SC} ≥ 1.1 wt%, when the PCL domains are melted. Limiting φ_{c SC} ≤ 6 wt% broadens the behaviour inherent to elastic cross-linked networks to the strain values up until breakage of the samples, while the increase of φ_{c SC} triggers plastic deformations typical for semi-crystalline polymers. Redistributing of internal stresses from the amorphous to crystalline domains at increase of φ_c calculated with the adopted model was identified as reason of PLA stereocomplexes failure as stable physical network junctions at higher φ_{c SC}. Within the experimentally determined strain and composition ranges, in which PLA stereocomplexes possess structural stability, they can form robust cross-links in a polymer network. The knowledge gained here provides valuable design criteria for multifunctional thermoplastic elastomers.