Houston Rockets center Alperen Sengun has agreed to a five-year, $185 million rookie extension, his agents Sean Kennedy and Jeff Schwartz of Excel Basketball told ESPN's Bobby Marks.

The contract includes a player option in the final year.

The deal comes before the rookie extension deadline at 6 p.m. ET. Sengun is the first player since Luka Doncic and Trae Young to sign a five-year rookie extension and have a player option.

The 22-year-old Sengun developed into an All-Star candidate last season – finishing third in Most Improved Player voting with an average of 21.3 points, 9.3 rebounds and 5 assists per game for Houston before his season was cut short at 5 p.m. with an ankle injury.

He was one of only six players to average at least 21, 9 and 5 last season, joining Doncic, Nikola Jokic, Giannis Antetokounmpo, Joel Embiid and Julius Randle.

Sengun was selected with the 16th pick in the 2021 NBA Draft by the Oklahoma City Thunder – with a pick that originally belonged to the Boston Celtics as part of the deal that sent Kemba Walker to OKC in exchange for Al Horford – before immediately re-selected was redirected to the Rockets.

He joins Jalen Green, who also agreed to a three-year, $106 million contract on Monday, as the Rockets secured members of the 2021 class long-term.

ESPN's Tim Bontemps contributed to this report.