1. Robin Lopez
Robin Lopez signed a one-year deal with the Washington Wizards last offseason and spent this past season with Russell Westbrook. Perhaps Lopez could follow Westbrook to LA and give the Lakers center depth.
Center is not a pressing need for the Lakers as Anthony Davis is going to have to play more center to avoid the floor spacing being an issue in the playoffs. He does not have to be a full-time center but Davis does have to close out games at the center position. A traditional center in crunch time with LeBron, Davis and Westbrook would be a nightmare.
The team still needs someone who can give 15-20 minutes at the center position during the regular season. Marc Gasol is the only traditional center on the roster and he is not the rim-protecting/rebounding big that the Lakers could bring off the bench while AD sits.
Lopez certainly is not the best option among the cheap center options but he is an option. There is a reality in which the Lakers miss out on the likes of Dwight Howard (who reportedly may want to re-join the Lakers) and Hassan Whiteside and have to sign someone like Lopez.
Lopez is not the most prolific rebounder or shot-blocker, hence why he is not one of the better options, but he still would give the Lakers seven-foot depth for the regular season.