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HESS J1702-420 is a PeVatron candidate without multi-wavelength associations. The identification of active PeVatrons comma CR accelerators reaching the knee openParfew 10elev15 eVclosePar comma is key to understand the origin of CRs in the Galaxy. With deep observations and improved analysis comma H.E.S.S. has recently found a new compact source comma hidden under the bulk emission of HESS J1702-420. Its straight and very hard powerlaw spectrum comma extending up to 100 TeV comma makes it a very solid PeVatron candidate. Remarkably comma Suzaku has detected comma with large uncertainties comma an X-ray source very close to the new compact TeV source. These facts comma together with the discovery of energy-dependent shrinking of HESS J1702-420 towards the new TeV source comma call for a deep XMM observation to investigate a PWN scenario.