Don't let the tight suit fool you: Jason Kidd can still ball and still has those juices flowing.

During another disappointing and injury-riddled season for Deron Williams, Kidd stepped on the court and went head-to-head with the point guard in a spirited exchange at a recent practice, a source told the Daily News.

That’s one way to get through to the underachieving star: challenge him with Hall of Fame skills.

Kidd has maintained that he’s too tired and out of shape to put on a uniform again, and NBA rules prohibit player-coaches, anyway — a change from when Bill Russell and Lenny Wilkens held that title in the 1960s and ’70s. But Kidd is still less than a year removed from his final game with the Knicks, and Williams could use some inspiration as he steps into the spotlight for his third return to Utah on Wednesday.

Exactly three years ago next week, the Nets acquired Williams in the franchise-altering deal with the Jazz, giving up a top prospect and two first-round picks for what GM Billy King called “the best point guard in the NBA.” It led to a debate about who acquired the better player at the 2011 trade deadline — the Nets with Williams, or the Knicks with Anthony.

But Williams has failed to live up to any expectations while battling injuries and confidence issues. Considering the MVP talk last summer, this season is probably the 29-year-old’s most disappointing, as he is averaging 13.3 points and 6.6 assists on 45% shooting. According to ESPN, the Nets turned down an offer to trade Williams to the Rockets, who were trying to package Jeremy Lin and Omer Asik.