  We perform an analysis of Lattice QCD data in the open-charm sector based on
the chiral SU(3) Lagrangian. The low-energy constants are adjusted to recover
the open-charm meson masses on Lattice QCD ensembles from HPQCD, ETMC and HSC
with pion and kaon masses smaller than 550 MeV. A significant set of low-energy
parameters is obtainable only if the most recent information from HSC on
scattering observables is included in our global fit. For the first time our
analysis considers the effect of left-hand cuts as developed in terms of a
generalized potential approach (GPA) previously by one of the authors. Here we
use coupled-channel interaction terms at the one-loop level. The elastic s-wave
and p-wave $D\,\pi$, $D K $ and $D \bar K $ scattering phase shifts on
ensembles with nominal pion masses of about 239 MeV and 391 MeV are reproduced
faithfully. Based on such low-energy parameters we predict s- and p-wave phase
shifts and inelasticities at physical quark masses, where the statistical
uncertainties in the phase shifts are smaller than 1 degree always. Most
striking would be the exotic s-wave $D_s \pi$ channel, for which we predict a
resonance state at about 2.287 GeV where the phase shift passes through 90
degrees.
