UNLV quarterback Matthew Sluka left the undefeated Rebels on Tuesday night over claims of unfulfilled verbal NIL promises from a UNLV assistant coach, a decision that illuminates the fragility of the current collegiate system and how talent is procured and retained.

Sluka's agent, Marcus Cromartie, told ESPN that UNLV didn't come through on a verbal offer of $100,000 from an assistant coach. The quarterback's father, Bob Sluka, told ESPN that head coach Barry Odom later said in a phone conversation that the offer wasn't valid because it didn't come from him, but rather from offensive coordinator Brennan Marion, who declined comment to ESPN.

UNLV and Shannon Cottrell, the director of athlete engagements for the Friends of UNLV collective, also did not immediately respond to requests for comment.

UNLV's collective did pay Sluka one $3,000 fee for an engagement he made this summer, according to Rob Sine, who runs Blueprint Sports, a company that manages the collective. Sine said Sluka's agents first made contact with the collective in late August to discuss future opportunities to work together.

Sine said he wasn't aware of any promises to pay Sluka $100,000 and that Sluka had not contacted the collective about missing payments as far as he knew.

The decisions come at a compelling moment for UNLV, as the Rebels are 3-0 and ranked No. 23 in the coaches poll, marking the first time the program has been ranked in any major poll in history.

UNLV defeated Big 12 programs Houston Cougars and Kansas with Sluka at quarterback and hosts Fresno State on Saturday in its Mountain West Conference opener. The Rebels' home game the following Friday night against Syracuse has become among the most anticipated in recent school history.

UNLV also is amid the process of deciding its conference future between the Pac-12 and Mountain West, a decision that looms large over the current structure of college athletics.

Because Marion's offer to Sluka was verbal and never formalized, there are varying versions of what happened. Sources told ESPN that Sluka approached Odom about the money in recent days and practiced Monday with the Rebels, but then didn't practice Tuesday. The senior transfer announced Tuesday on social media that he would not play for the Rebels again this season and that he planned to use his redshirt this year.

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Matthew Sluka (@MatthewSluka) September 25, 2024

The only formal offer from the school, according to Cromartie, was an offer of $3,000 a month for four months. The only money Sluka has received from UNLV, per Cromartie, was $3,000 for moving expenses.

The tension point appears to center around the verbal offer. While reports emerged from UNLV about Sluka asking for more money, Sluka insists that all he was asking for is what the program verbally promised. With no contract required up front because of the vagaries of NIL rules and third parties technically in charge of giving athletes the deals, the ambiguity over the validity of verbal offers hangs over the enterprise of college athletics.

According to his father and agent, at no time did Sluka ask for an adjustment to the initial deal that was promised. When Sluka reported to UNLV in the summer, he was told the money would be distributed on a payment plan. He was later told that payment would come after he enrolled in school and began classes, according to his father.

The school and collective did formally offer $3,000 per month for four months, according to Cromartie, which was $88,000 less than what Sluka and Cromartie were told verbally last winter.

The current system for paying college athletes -- one in which schools can make financial offers to players during the recruiting process but can't directly fulfill those promises -- may soon be changing. As part of a pending antitrust lawsuit, the NCAA has agreed to allow its schools to pay players directly. If the settlement is approved in court, the new system has the potential to give both players and teams more security by allowing them to enter more direct contracts with one another.

After UNLV's games began, Cromartie contacted Cottrell and director of player development Hunkie Cooper.

"They keep deferring -- 'We don't know. You have to wait,'" Bob Sluka said. "Then it was like, 'We're going to give him game checks.' So we're like, 'OK, great.' We did not ask for a single dollar [more]. At one point, we are out of pocket for him to be there, because his expenses to live there weren't even being covered."

Bob Sluka told ESPN that Marion and the agents from Equity Sports agreed to a verbal deal back in the winter, after a recruiting visit where they spent most of their time with Marion but also met with the entire coaching staff.

"We left there understanding that we were going to get a certain dollar amount for Matt to come there on the NIL deal, not a blowout number, but a reasonable, fair number," Bob Sluka said, adding that Matthew later received more than 25 NIL offers from other schools, including Big Ten and SEC teams, that were "four, five times the amount money we were willing to take from UNLV."

After the money from UNLV's verbal promise never materialized, Sluka decided to leave the team and take advantage of his redshirt opportunity.

NCAA redshirt rules allow players to retain a year of eligibility if they play four or fewer games in a season. Sluka, who played four seasons (2020-23) at FCS program Holy Cross before transferring to UNLV this past offseason, still has one more year of eligibility that he could use at another school next season.

NCAA rules do not allow players to play for two schools within the same season.

UNLV is 3-0 for the first time since 1984 and also received 53 total points in the latest Associated Press poll, just 16 points behind No. 25 Boise State. The Rebels, who upset Kansas on the road in Week 3, also began the season with a victory against Houston, making them 2-0 against Big 12 teams and raising hopes they could contend for a spot in the newly expanded 12-team College Football Playoff.

Sluka has completed 21 of 48 passes for 318 yards and six touchdowns with one interception this season, his first with the Rebels. He also has rushed 39 times for 286 yards and a score.

In UNLV's 23-20 upset victory at Kansas on Sept. 13, Sluka led the Rebels on an 18-play, 75-yard drive that ended with Kylin James scoring on fourth-and-goal from the 1-yard line with 1:51 left. Sluka rushed for 113 yards in the game.

After the victory, Bob Sluka said that Cromartie spoke with Cooper in the stadium tunnel about Sluka's deal, and Cooper said to call him the following week. On Sept. 19, Cooper and Odom called Cromartie.

Bob Sluka said the call yielded the idea that Marion didn't have authority to make that caliber of an offer. Bob Sluka said the family never heard from UNLV's collective and is in a state of confusion about what happened.

"We have no idea what the hell happened," Bob Sluka said. "No one can explain this. Why would you let your starting quarterback walk out of the building? We did not ask for a penny more than what was agreed upon (this winter)."

Sluka spent the first four years of his college career at Holy Cross, where he is first in career pass efficiency (147.4), second in career rushing yards (3,583), second in career rushing touchdowns (38), fifth in career passing yards (5,916) and fifth in career passing touchdowns (59). He rushed for an NCAA Division I quarterback record 330 yards in a loss to Lafayette in 2023.

Holy Cross reached the FCS playoffs in 2021 and 2022 with Sluka as the starter. After a coaching change at Holy Cross -- head coach Bob Chesney left to take over at James Madison -- Sluka also moved on.

Sluka now plans to work out with a quarterback trainer this fall and enroll at a school in January with time to learn the system, something he wasn't able to do because he was graduating from Holy Cross last spring.

With Sluka now out of the picture, UNLV figures to turn to either senior transfer Hajj-Malik Williams or senior Cameron Friel as its starting quarterback. UNLV went 9-5 last season and played for the Mountain West championship, but the quarterback who led that team to the program's best season in nearly 40 years, Jayden Maiava, transferred to USC.

ESPN's Dan Murphy and The Associated Press contributed to this report.