Since its discovery more than one hundred years ago, the origin of the cosmic-ray flux measured on Earth is still unknown: in order to explain the region under the knee, supernova remnants (SNRs) are usually addressed as PeV cosmic accelerators. In particular, young SNRs are potential candidates since they might act as PeVatrons at least during some initial stage of their evolution: among these, the brightest TeV SNR is RX J1713.7-3946. However, no clear indication of PeV energies has been observed so far in such a kind of sources. Recently, the Galactic Center region has been detected as a multi-TeV gamma-ray emitter. Two emission regions have been resolved by H.E.S.S.: a point source, spatially associated to the known radio source SgrA*, and a diffuse flux, characterised by a simple power law gamma-ray spectrum with no visible cut-off up to gamma-ray energies of about 50 TeV. Such a detection triggers the search for PeVatron at the center of our Galaxy. A clear evidence of the hadronic nature of the emission would be the detection of a neutrino counterpart. I will here review the potential of the under construction KM3NeT for the detection of these and other galactic sources, in view of the discovery power of the next generation ground-based instrument CTA.