
The lightweight matchup was not officially confirmed by the organization, but it was targeted and would have likely been slotted for the pay-per-view portion of the card.
It remains uncertain whether Varner will still fight on the April 24 card.
In January, Varner (16-3) lost his belt to Ben Henderson, who will be rematching Donald Cerrone at WEC 48. The third-round guillotine choke was Varner's first loss since tapping to an armbar against Hermes Franca at UFC 62 in August 2006.
Olympic-level wrestler Shalorus (6-0-1) has won both his WEC fights. At WEC 46, Shalorus became the first man to hand a loss to Team Quest's Dave Jansen.