As expected, San Antonio Spurs center Tim Duncan will agree to a three-year contract extension this week, Yahoo Sports reports.

Duncan will sign a three-year contract extension, worth $36 million and, according to ESPN, it is fully guaranteed with a third-year player option and it contains a no trade clause.

Also according to Yahoo Sports, the Spurs have reached agreements with free agents Danny Green (three years, $12 million) and Boris Diaw (two years, $9.2 million).

Duncan, 36, completed his 15th year with the Spurs, averaging 15.4 points per game in the 2011-2012 regular season.