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Virtual leptoquarks could be detected at HERA through some nonstandardeffects. Here we explore the possibility that virtual leptoquarks could bediscovered via $e u --> e c$ scattering, assuming integrated luminosity of 200pb$^{-1}$ and charm identification efficiency of 1%. We study the implicationsof low energy data for the leptoquarks couplings and find that the mostrelevant bound for the HERA cross sections comes from inclusive $c -->e^+e^-~+~any$. This bound implies that the $e u --> e c$ cross sections forvirtual leptoquarks are just too small for observation of the signal. With animprovement by a factor of ~2 on the luminosity or on charm identification itcould be possible to see virtual leptoquarks with {\it maximum couplings} up to~1.5 - 2 TeV. However, the prospects for discovering the virtual particles iftheir couplings are somewhat below present bounds are very dim. We point outthat this cross section could be very large for leptoquarks lighter than HERA'skinematical limit, and if such a leptoquark is discovered we recommendsearching for a possible $e u --> e c$ signal. Our results may also serve as anupdate on the maximum cross sections for leptoquark mediated $e u --> \mu c$scattering.Comment: 15 Pages (LaTeX), including 4 postscript figures at the end of the  file. Feynman diagrams available by reques

Can HERA see aneu→ecsignal of a virtual leptoquark?