Lee spent time with both the Celtics and the Mavericks last season after spending the prior five years playing for the Warriors. The two-time All-Star is still a prolific scorer and rebounder on a per minute basis but has consistently seen his playing time drop because of concerns about his porous defense. He has not been able to carve out a consistent role for himself over the past three seasons and at 32 years of age, his better days are likely behind him.
He's still a solid addition to the Spurs' big men rotation, as there was no proven backup power forward on the roster. Lee's combination of defensive rebounding and ability to attack on short rolls as a dive man was something that the bench was lacking, so his presence will give Gregg Popovich more options. He will likely hurt the second unit on defense but his negative impact might be mitigated if he shares the court with LaMarcus Aldridge or Dewayne Dedmon.
Lee is far from perfect but the Spurs were running out of options to round out their roster and getting a veteran who can still contribute for the minimum this late in the offseason counts as a win.
Last season Lee averaged eight points and five rebounds while shooting 53 percent from the floor in 16 minutes a game.