It seems too early to project where Olivera might fit long term on a defensive basis. But when the Braves were pursuing him as a free agent this past winter, there was talk that he would likely end up as a left fielder if he signed with Atlanta.
Although Nick Swisher and Michael Bourn might not be viewed as everyday options, they will both return to Atlanta as left field options, unless the Braves are able to creatively move at least one of those contracts. Adonis Garcia stands as another option to occasionally use in left field or at third base.
Despite the limited range he showed during his short time playing third base, Olivera appears to be a better defensive option at third base than Garcia.
Unless the Braves take a chance on David Freese or find another option via trade, Olivera might actually be the club's best option at third base for at least another year. But there is still reason to plan for the strong possibility that he could end up in left field before his contract expires after the 2020 season.