Luka Doncic's return to the Dallas Mavericks may have just encountered a setback during the team's practice on Monday.

The Mavs star, who has been listed as questionable for their second straight game against the Los Angeles Clippers, appeared to re-aggravate his left knee injury during scrimmage. According to Callie Caplan of the Dallas Morning News, Doncic suddenly shouted in pain and had to leave the floor. He went to the bleachers and grabbed his left knee, eventually leaving the floor with ice wrapped around the injured area.

Luka Doncic has missed the Mavs' last three games after sustaining knee and ankle injuries during their game against the Denver Nuggets on November 15. And by the looks of it, he is in trouble of missing his fourth straight outing if his latest setback proves to be serious.

Dallas has lost all three games that the Slovenian has missed. Although Kristaps Porzingis has been on a tear offensively in carrying the offensive load, the Mavs have really felt the absence of Luka. Simply put, without Doncic, the team doesn't have anyone who can take over and close games for them.

Hopefully, Doncic's injury is not serious and he would be able to suit up for the team when they play the Clippers on Tuesday. If not, Dallas might be looking at a 0-4 road trip and a further drop in the standings.