So start Leo, and bring him off if he tires badly. This is exactly what Poyet did for Ulloa's debut (against Arsenal) and there were no lasting effects.
It might suit Barnes, too - I can't see a rest doing Barnes any harm at all.
-------------------------- Kuszczak -------------------------
Bruno ---------- El Abd ----------- Upson ----------- Ward
David ------------------- Bridcutt ----------------- Lua Lua
------------- Crofts --------------------- Ince --------------
-------------------------- Ulloa...