OKLAHOMA CITY  — The Oklahoma City Thunder took a big step toward sticking around as an NBA championship contender.

The Thunder and general manager Sam Presti still face difficult decisions in the team’s quest to remain a title threat for the long haul after reaching the NBA Finals last season, but reaching a contract extension with blocks leader Serge Ibaka is certainly a good start.

Ibaka came to terms on the deal on Saturday as the Thunder locked up another key member of their nucleus while also putting into question whether the small-market team can afford to keep Sixth Man of the Year James Harden beyond next season..

Ibaka posted on Twitter that he was happy for the chance to play for the Thunder for five more years.