Potential log canonical centers

Given an ambient variety $X$ and a fixed subvariety $Z$ we give sufficient conditions for the existence of a boundary $\mathrm{\Delta }$ such that $Z$ is a log canonical center for the pair $(X,\mathrm{\Delta })$. We also show that under some additional hypotheses $\mathrm{\Delta }$ can be chosen such that $(X,\mathrm{\Delta })$ has log canonical singularities.