The renormalization, finiteness and off-shellness of short distance power like singular interactions is discussed. We show analytically that the renormalizability of the off-shell scattering amplitude relies completely on the corresponding on-shell amplitude without proliferation of new counterterms. We illustrate the result by complementary calculations both in coordinate as well as in momentum space in the simplest 1 S0 channel for chiral np interactions including Two Pion Exchange. A traditional source of theoretical uncertainty in the study of nuclear physics and nuclear reactions has been the relevance and significance of off-shellness in the NN force (For a review up to the mid seventies see e.g. [1] and references therein). As is well known, any off-shell ambiguity should cancel in the final results and off-shellness itself cannot be measured as a matter of principle. This does not necessarily mean, however, that off-shellness can generally be completely disposed of and most few-and many body calculations do involve off-shell quantities as intermediate stages. This feature relies on the fundamental fact that quantum mechanics is naturally formulated in terms of wave functions while they are not directly measurable quantities except at asymptotically large distances. A paralell statement for Quantum Field Theory applies for the fields themselves as well as the associated Green functions.Potential approaches to the NN interaction need the half off-shell extrapolated potential and the half off-shell T-matrix is used to determine the on-shell S−matrix. Moreover, a knowledge of the off-shell T-matrix is needed e.g. for nucleon-nucleon bremsstrahlung, the three nucleon problem as well as nuclear matter calculations and thus a phenomenological determination of the off-shell T-matrix has been the subject of intense research in the past [1]. A relevant issue in this regard is that the definition of off-shellness is largely conventional. Actually, the quantum mechanical trading between two body off- . Moreover, unitarity for the three body problem rests on off-shell unitarity for the two body problem, imposing constraints on the acceptable off-shellness [5,6].Within the Effective Field Theory (EFT) approach to nuclear physics based on chiral symmetry [7,8] (for comprehensive reviews see e.g. Ref. [9,10,11]) the ambiguities related to off-shellness can be rephrased in the freedom to undertake field dependent transformations and using the equations of motion. Actually, in purely contact EFT's, where the interaction is represented by a polynomial in momenta and/or energy, off-shellness can be completely ignored from the start by using local field redefinitions [4,12]. This fact does not generally hold for finite range interactions stemming from particle exchange if the exchanged momentum becomes comparable to the exchanged particle mass and where non-local and singular field redefinitions would be needed. Similarly to phenomenological potentials, Chiral potentials are not free from these ambiguities since by construct...