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.

The Oklahoma City Thunder and forward Jalen Williams have agreed to a five-year max extension worth as much as $287 million, according to ESPN's Shams Charania.

The NBA champion Oklahoma City Thunder have agreed a five-year contract extension worth up to $287 million with 24-year-old All-Star forward Jalen Williams, ESPN reported Thursday.ESPN cited Williams's agents in reporting the extension of Williams's rookie contract -- which makes the 24-year-old the latest key piece of Oklahoma City's title run to commit to the Thunder long-term.