The Chicago Bulls arrived at the United Center with their NBA Playoff series against the Milwaukee Bucks tied at a game apiece. The Bulls had a chance to seize control of the series with Bucks forward Khris Middleton sidelined, though that hasn't been the case, as Milwaukee has been the one in control, heading back home with a commanding 3-games-to-1 lead. If that wasn't discouraging enough, the Bulls are dealing with a key injury of their own, as guard Alex Caruso was forced to exit the Game 4 loss after taking an elbow to the face from Bucks guard Jevon Carter. Caruso, who is in the league's concussion protocol, could now be in serious doubt of suiting up in Game 5 vs. the Bucks. Jamal Collier of ESPN has the latest.

Per Collier, Caruso remains day-to-day and is still “uncertain” for Game 5 vs. the Bucks. The Bulls guard is still experiencing concussion symptoms with an elimination game looming on Wednesday.

That doesn't leave a whole lot of time for Caruso to exit the protocols. The former Los Angeles Laker was perhaps the team's best defender in all season long, as evidenced by his 1.7 steals per game and career 108 defensive rating.

There's a real chance that the Bulls could walk into the Fiserv Forum on Wednesday night facing NBA playoff elimination without one of their key playmakers on both sides of the ball. That would make a potential comeback even more difficult.