The NBA Finals may hingeon one right leg. Specifically, the right leg of Pacers All-Star guard Tyrese Haliburton, who suffered another injury or re-aggravated a previous one – Haliburton saidafter Game 5he is not sure which – in Indiana's120-109loss to Oklahoma City on Monday, June 16. Haliburton is scheduled to have an MRI Tuesday, June 17, a person with knowledge of the situation confirmed to USA TODAY Sports. The person spoke under the condition of anonymity because the person was not authorized to publicly discuss details of the injury. Pacers coach Rick Carlisle will hold a news conference Wednesday, June 18, following Indiana's practice, and may reveal findings from the MRI then. ESPN was first to reportthe news of the MRI, and also added that Haliburton is believed to have a strained right calf. Haliburton fell while driving to the basket in the opening quarter and came up holding his right calf. He went to the locker room, but returned in the second quarter. He scored just four points and didn't make a basket - both career playoff lows. While it's unclear how much - if at all - the leg injury is affecting his shooting, one thing is clear. The Pacers must have Haliburton's offense to win the championship. And they have to win Game 6 in Indianapolis to force a decisive Game 7. Will he be able to play in Game 6 on Thursday, June 19? "He's not at a hundred percent," Pacers coach Rick Carlisle said after Game 5. "It's pretty clear. But I don't think he's going to miss the next game. We were concerned at halftime, and he insisted on playing." Haliburton was more forceful in his reply: "It's the Finals, man. I've worked my whole life to be here and I want to be out there to compete. Help my teammates any way I can. "I was not great tonight by any means, but it's not really a thought of mine to not play here. If I can walk, then I want to play. ... Got to be ready to go for Game 6." Tyrese Haliburton and coach Rick Carlisle said after Game 5 that the Pacers guard would play. However, Carlisle also said they would monitor Haliburton and "evaluate everything with Tyrese." The team could make a formal announcement any time, but the final injury report is due Thursday. TheOklahoma City Thunderwill play theIndiana Pacersin Game 6 on Thursday, June 19. The game is at Gainbridge Fieldhouse in Indianapolis. Game 6 is at 8:30 p.m. ET. ABC will carry Game 6. The biggest stories, every morning. Stay up-to-date on all the key sports developments bysubscribing to USA TODAY Sports' newsletter. This article originally appeared on USA TODAY:Tyrese Haliburton injury: Pacers star undergoing MRI today