We show that BLG-ABJM type of theories, discovered in the context of the AdS/CFT correspondence, generates gauge propagators with the complex pole structure prescribed by the Gribov scenario for confinement, which was developed in the context of Yang-Mills theories. This structure, known as i-particles in Gribov-Zwanziger theories, effectively allows the definition of composite operators with a positive Källén-Lehmann spectral representation for their two-point functions. Therefore, these operators satisfy the criteria to describe glueball condensates. We calculate the (first-order) contribution to the two-point function of the gauge invariant condensate in the ABJM framework. We show that the correlator can be interpreted as a physical composite particle state in terms of the Källén-Lehmann representation.