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We report the discovery of an additional substellar companion in the CoRoT-20system based on six years of HARPS and SOPHIE radial velocity follow-up.CoRoT-20 c has a minimum mass of 17 $\pm$ 1 $M_{Jup}$ and it orbits the hoststar in 4.59$\pm 0.05$ years, with an orbital eccentricity of 0.60 $\pm$ 0.03.This is the first identified system with an eccentric hot Jupiter and aneccentric massive companion. The discovery of the latter might be an indicationof the migration mechanism of the hot Jupiter, via Lidov-Kozai effect. Weexplore the parameter space to determine which configurations would triggerthis type of interactions.

A 4.6-year period brown-dwarf companion interacting with the hot-Jupiter CoRoT-20 b