The New York Jets rookie players are scheduled to report for training camp on Friday. Will Quinnen Williams be with them?

Williams could be missing if he doesn't sign his rookie contract on Thursday.

As Alabama’s nose guard, the former Wenonah High School standout earned unanimous All-American recognition and won the Outland Trophy as the nation’s top interior lineman in 2018. The Jets added Williams with the third choice in the NFL Draft on April 25.

Williams' draft status comes with a four-year contract worth about $32.5 million, with around $21.6 million of that in the form of a signing bonus. Like all first-round selections, Williams' rookie deal also will include a team option for a fifth season.

Williams participated in the Jets' offseason program. But training camp involves contract drills, which are prohibited during the offseason work, and New York will start its four-game preseason schedule on Aug. 8. With the risk of injury higher, players without contracts usually are reluctant to take part.

Williams isn't alone among 2019's top draft picks. Oklahoma quarterback Kyler Murray, the No. 1 choice, has signed with the Arizona Cardinals, and Clemson defensive end Clelin Ferrell, the No. 4 choice, has signed with the Oakland Raiders. But the other four players among the first six selections remain unsigned.

Last year, the Jets used the No. 3 selection on Southern Cal quarterback Sam Darnold. He hadn't signed his contract when training camp opened and missed the first three days while getting a deal done.

The representatives of Williams and the other unsigned college stars aren't haggling with NFL teams over the size of their contracts. Their values are predetermined, based on the NFL’s salary cap of $188.2 million for the 2019 season and this year’s rookie compensation pool in a formula spelled out in the Collective Bargaining Agreement between the league and its players association.

So what's the holdup?

Williams’ contract will be fully guaranteed. As the No. 3 draft pick, guaranteed money wouldn’t even be a negotiating point, as it might have been for Williams’ former Alabama teammate, running back Josh Jacobs, in working out his contract with the Oakland Raiders after they chose him 24th in this year’s draft.

Jacobs signed his contract last week with the entire $11.9 million guaranteed. The 24th player picked in the 2018 NFL Draft, Maryland wide receiver D.J. Moore, did not receive a fully guaranteed contract from the Carolina Panthers.

Without guaranteed money to haggle over, the sticking points for NFL Draft picks under the current structure usually involve offsets and signing-bonus payments.

An offset in a contract means if a team releases a player while owing him money, it can subtract his salary from that amount if he signs with another team.

For example, Jacobs is scheduled to have a base salary of $2.122 million in 2022, the fourth season of his contract. If the Raiders were to release him before the 2022 season and another team signed him for the minimum salary, then Oakland could subtract that from what it owed Jacobs. This year's minimum salary for a fourth-year player is $805,000. Using that for this example, the Raiders would owe Jacobs $1.317 million in 2022 instead of $2.122 million if his contract contains offset language.

Players don't want offset provisions in their contracts because they can get paid by two teams at the same time without it. In the example using Jacobs, the running back could collect the full $2.122 million from the Raiders and his $805,000 salary from his new team as long as his rookie contract did not include an offset clause.

By its name, a signing bonus would imply payment when the player signs the contract. But teams aren't required to pay the full amount at signing if they can negotiate their way out of it. Sometimes, the signing bonus ends up being prorated over the length of the contract. In Williams' case, the Jets might want to pay the signing bonus in four annual installments instead of all at once.

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Mark Inabinett is a sports reporter for Alabama Media Group. Follow him on Twitter at @AMarkG1.