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The discovery of the $Z_c(3900)^\pm$ and $Z_b(10610)^\pm$ structures in theheavy quarkonium spectrum showed the need to incorporate hadron structuresbeyond the naive $qqq$ and $q\bar q$ systems in quark models. The new chargedstructure called $Z_{cs}(3985)^-$, spotted in the $K^+$ recoil-mass spectrumclose to the $D^-_s D^{*0}/D^{*-}_sD^0$ threshold, is a new evidence in thisline. In this work, we analyze the $Z_{cs}(3985)^-$ state, following thecalculation of the $Z_c$ and $Z_b$ states using a chiral constituent quarkmodel in a coupled-channels calculation, with all the parameters constrainedfrom previous calculations. The pole structure of the S-matrix shows twovirtual poles below the $D_s^-D^{*\,0}$ and $D_s^{*\,-}D^{*\,0}$ thresholdscompatible with the $Z_{cs}(3985)^\pm$ and a new predicted $Z_{cs}(4110)^\pm$structure, the SU(3) flavor partner of the $Z_c(4020)^\pm$. The $K^+$recoil-mass spectrum is calculated in good agreement with LHCb and BESIIIexperimental data, with no fine tuning of the model parameters. Our resultsindicate that the $Z_{cs}(3985)^\pm$ and $Z_{cs}(4000)^\pm$ signals originatefrom the same virtual state.

The $Z_{cs}(3985)^-$ structure in a coupled-channels model