  We present stellar parameter estimates for 939,457 southern FGK stars that
are candidate targets for the TESS mission. Using a data-driven method similar
to the CANNON, we build a model of stellar colours as a function of stellar
parameters. We then use these in combination with stellar evolution models to
estimate the effective temperature, gravity, metallicity, mass, radius and
extinction for our selected targets. Our effective temperature estimates
compare well with those from spectroscopic surveys and the addition of Gaia DR2
parallaxes allows us to identify subgiant interlopers into the TESS sample. We
are able to estimate the radii of TESS targets with a typical uncertainty of
9.3\%. This catalogue can be used to screen exoplanet candidates from TESS and
provides a homogeneous set of stellar parameters for statistical studies.
