The Oklahoma City Thunder have added a fourth year to a contract extension offer to coach Scott Brooks, but the two sides still have significant differences on salary, league sources told Yahoo! Sports.

Brooks’ contract expires on Saturday, and he could immediately become a candidate for the Portland Trail Blazers , sources said. Thunder GM Sam Presti and Brooks’ agent, Warren LeGarie, have had conversations this week, but there is still a gap between the sides.

via Adrian Wojnarowski of al to coach Scott Brooks – Yahoo! Sports.