In the near future the Planck satellite [1] will gather impressive information about the anisotropies of the cosmic microwave background and about the galaxy clusters which perturb that signal. We will here review the ability of Planck to extract information about these galaxy clusters through the Sunyaev-Zeldovich imprint. We will conclude that Planck will provide a catalogue of galaxy clusters, which will be very useful for future targeted observations. We will explain why Planck will not be very good in extracting detailed information about individual clusters, except for the dominating Compton parameter, y, which will be measured to a few percent for individual clusters. In this last point I am being rather conservative, but that will leave space for pleasant surprises when the Planck data will be analysed.

1. Introduction

2. Extracting the CMB

3. The Sunyaev-Zeldovich effect

4. Finding the clusters

5. Cosmology from the cluster catalogue?

6. Cluster parameters from single clusters

7. Conclusions