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This paper presents and examines new near-infrared integral fieldobservations of the three so-called 'embedded star clusters' located in thenuclear region of NGC1365. Adaptive-optics- corrected K-band data cubes wereobtained with the ESO/VLT instrument SINFONI. The continuum in the K-band andemission lines such as HeI, Bracket-gamma, and several H2 lines were mapped atan achieved angular resolution of 0.2arcsec over a field of 3x3arcsec^2 aroundeach source. We find that the continuum emission of the sources is spatiallyresolved. This means that they are indeed cluster complexes confined to regionsof about 50pc extension. We performed robust measurements of the equivalentwidth of the CO absorption band at 2.3micro and of Bracket-gamma. For the mainmid-infrared bright sources, the data only allow us to determine an upper limitto the equivalent width of the CO bands. Under the assumption of aninstantaneously formed standard initial mass function Starburst99 model, thenew measurements are found to be incompatible with previously publishedmid-infrared line ratios. We show that an upper mass limit of 25 to 30 solarmasses, lower than the typically assumed 100solar masses, allows one to simplyremove this inconsistency. For such a model, the measurements are consistentwith ages in the range of 5.5Myr to 6.5Myr, implying masses in the range from 3to 10 x 10^6 solar masses. We detect extended gas emission both in HII and H2.We argue that the central cluster complexes are the sources of excitation forthe whole nebulae, through ionisation and shock heating. We detect a blue wingon the Bracket-gamma emission profile, suggesting the existence of gas outflowscentred on the cluster complexes. We do not find any evidence for the presenceof a lower mass cluster population, which would fill up a 'traditional' powerlaw cluster mass function.

High angular resolution near-infrared integral field observations of young star cluster complexes in NGC1365