PDFs and LHC data: current and future constraints

The LHC has released an enormous amount of precise measurements that provide a unique constraint on Parton Distribution Functions (PDFs). In this contribution a short overview on our current knowledge of the the structure of the proton is given and the effect of the inclusion of the LHC data in PDF fits is illustrated. In particular, the current measurements of the transverse momentum of the electroweak vector bosons by ATLAS and CMS, and of the forward W production by LHCb, are analysed and their impact assessed