Boston Celtics point guard Kemba Walker won't play on Friday against the Orlando Magic.

Walker is dealing with a sore knee. The All-Star went through shootaround, but he has since been ruled out.

It's a preseason game, so there's no need for the Celtics to play Walker if he's not 100 percent. It gives head coach Brad Stevens an opportunity to play some other guys and test out the depth of the roster.

Walker has career averages of 19.8 points, 3.8 rebounds and 5.5 assists in 605 games. He put up 25.6 points and 5.9 assists last season with the Charlotte Hornets. The three-time All-Star signed a four-year deal with the Celtics this summer as part of a sign-and-trade deal with the Hornets.

The Celtics are very fortunate they were able to replace Kyrie Irving with Walker, who is looking forward to go on a deep playoff run in Boston — something he was never able to accomplish in Charlotte. Walker is one of the best slashers and finishers in the league, and he always commands heavy traffic around him when he’s driving toward the basket.

Walker's new Celtics teammates are going to get wide-open looks when he penetrates to the rim and collapses the defense throughout the regular season.