The New Orleans Pelicans have been forced to reduce Zion Williamson's training programme after scans identified the source of his foot soreness.

Former first overall pick Williamson is yet to feature in 2021-22 after undergoing surgery on a right foot fracture in the offseason.

The ex-Duke sensation had been cleared to participate in full team activities late last month, only to soon take a step back due to soreness.

That setback delayed Williamson's return, and Pelicans fans now face an even longer wait to see their star player in action following another injury update.

"After experiencing persistent soreness in his right foot, Zion Williamson underwent medical imaging which showed a regression in the bone healing of his fifth metatarsal," a team statement read on Saturday.

"As a result, the volume and intensity of his training will be reduced for an extended period to help allow for further bone healing. Additional updates will be provided as warranted."

Williamson has been restricted to just 85 games through his first three seasons in the NBA. Among players in the 2019 draft class, he ranks joint-29th in that regard and 17th for minutes (2,694).

However, only Ja Morant (2,855) and RJ Barrett (2,445) have scored more points in the regular season than Williamson (2,187), whose average (25.7 points per game) is by far the best in his class (Morant 19.2, Barrett 16.0).

Although the Pelicans have a miserable 69-103 record since the start of 2019-20, they have been a competitive 40-45 with Williamson in the team.