Isaiah Hartenstein is set to sign a three-year contract extension worth about $75 million with the Oklahoma City Thunder, according to reports citing a person with knowledge of the negotiations and the Associated Press. ESPN had first reported the agreement late Friday, and additional coverage indicates the team has not yet made a formal announcement confirming the deal’s finalization. The contract is described as adding three years and approximately $75 million to his existing arrangement. Hartenstein is a 7-foot center who has been a two-year starter for Oklahoma City, with coverage noting the Thunder’s strong record during the past two regular seasons when he plays. One report states he averaged 9.2 points and 9.4 rebounds per game during the most recent season and started 20 games. Thunder general manager Sam Presti is quoted praising Hartenstein’s performance after the season ended. The reports also note Hartenstein previously played for multiple teams, including stints with New York, Houston, Denver, Cleveland, and the Los Angeles Clippers before joining the Thunder.