Charmonium production at heavy-ion colliders is considered within the comovers interaction model. The formalism is extended by including possible secondary J/psi production through recombination and an estimate of recombination effects is made with no free parameters involved. The comovers interaction model also includes a comprehensive treatment of initial-state nuclear effects, which are discussed in the context of such high energies. With these tools, the model properly describes the

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... ty and the rapidity dependence of experimental data at RHIC energy, √(s) = 200 GeV, for both Au+Au and Cu+Cu collisions. Predictions for LHC, √(s) = 5.5 TeV, are presented and the assumptions and extrapolations involved are discussed.