For Quero to be put on the 60-day IL he would needed to be added to the MLB then placed on the 60-day IL which would have him start accumulating service time.
Gasser can go to the 60-day. Ross can be moved to the 60-day. Then you also have guys like Roller, Capra, Junk who could be DFA'd relatively easily.
They could recall Uribe and throw him on the 60-day IL with him having meniscus surgery as well but same story as Quero that he would be accumulating service time in that scenario.