Popovich said the All-Star forward was "absolutely" a full participant in practice Saturday.
Leonard hurt his ankle in Game 5 of the conference semifinals against the Houston Rockets on Tuesday. A source told ESPN's Michael C. Wright that Leonard could have played in Game 6 on Thursday night, but the Spurs decided they'd rather have him healthy for Sunday.
Leonard sat out much of the fourth quarter of Game 5 against the Rockets and didn't take the court for overtime after he came down on the foot of James Harden while turning to run up the court with 5 minutes, 37 seconds left in the third quarter.
Leonard, an MVP candidate this season, is averaging 27.8 points and 7.7 rebounds in the playoffs.
"He's a soldier, man. He's a fighter,'' Warriors star Kevin Durant said. "If he's out there, he's not going to make any excuses.''
Information from ESPN's Michael C. Wright was used in this report.