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The discovery of a new charged structure in the $K^+$ recoil-mass spectrumnear the $D^-_s D^{*0}/D^{*-}_sD^0$ threshold, dubbed $Z_{cs}(3985)^-$,reinforce the idea that the structure of hadrons goes beyond the naive $qqq$and the $q\bar q$ structures.  The existence of this state, with quark content $c\bar c s\bar u$, can beexpected from the well-established $Z_c(3900)^\pm$ and $Z_c(4020)$ states usingSU(3) flavor symmetry. The $Z_c$ structures have been explained using thechiral constituent quark model in a coupled-channels calculation and, in thiswork, we undertake the study of the $Z_{cs}(3985)^-$ using the same model.  We are able to reproduce the $K^+$ recoil-mass spectrum without any finetuning of the model parameters. The study of the analytical structure of theS-matrix allows us to conclude that the structure is due to the presence of onevirtual pole. A second state, the SU(3) flavor partner of the $Z_c(4020)$ ispredicted at $\sim\!\! 4110$ MeV/$c^2$. New states in the hidden bottom strangesector are also predicted.

The strange partner of the $Z_{c}$ structures in a coupled-channels model