  Recently, a number of new galaxy clusters have been detected by the
ESA-Planck satellite, the South Pole Telescope and the Atacama Cosmology
Telescope using the Sunyaev-Zeldovich effect. Several of the newly detected
clusters are massive, merging systems with disturbed morphology in the X-ray
surface brightness. Diffuse radio sources in clusters, called giant radio halos
and relics, are direct probes of cosmic rays and magnetic fields in the
intra-cluster medium. These radio sources are found to occur mainly in massive
merging clusters. Thus, the new SZ-discovered clusters are good candidates to
search for new radio halos and relics. We have initiated radio observations of
the clusters detected by Planck with the Giant Metrewave Radio Telescope. These
observations have already led to the detection of a radio halo in
PLCKG171.9-40.7, the first giant halo discovered in one of the new Planck
clusters.
