Williams has agreed to a five-year maximum rookie extension that could reach $287 million, according to ESPN. This OKC "big three" is now locked in with the Thunder for multiple years and could account for as much as $822 million on the payroll.

Oklahoma City ensures its young All-Star forward will stay put with a deal reportedly worth up to $287 million.

The Oklahoma City Thunder have crossed their I's and dotted their T's. They have signed Jalen Williams to a five-year, $287 million contract extension that'll keep him in OKC through the 2030-31 season. There are some incentives involved, but it's the most money the 24-year-old could've gotten.