Abstract　 　　 

　 As a part of LOBSTAR project (Luci OBservations of STARburst regions) which aims at understanding the stellar content of young star-forming regions, I present our first result on the high-mass stellar content of W49. Near-infrared imaging observations are obtained with LUCI at the Large Binocular Telescope (LBT) and SOFI of New Technology Telescope(NTT). The K-band spectra (ISAAC/VLT) of the candidate massive stars provide us with more reliable spectral types than photometry alone. Four massive stars are identified as O3V-O5V stars while indications for an O2If-O3If star are found for a possible very massive star. After spectroscopic classification (and applying the proper extinction law), the objects can be placed in a Hertzsprung–Russell diagram. With comparison to stellar evolution models, the age of the cluster is estimated as lower than 2Myrs and the mass of the massive stars are calculated.