WALTHAM, Mass. (AP) The Boston Celtics brought Al Horford out for the media on Friday even as they wait for their new deal with the former Atlanta Hawks big man to be approved by the league office.

Owner Wyc Grousbeck said that was just a formality, and he welcomed Horford to Boston.

Horford agreed to a four-year, $113 million contract in the first hour of NBA free agency last week. He'll be the biggest free agent ever signed by the league's most decorated franchise.

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The Celtics had hoped signing Horford would help them land an even bigger fish. But Kevin Durant signed with the Golden State Warriors instead.

For the Horford news conference, the Celtics changed all the numbers on the practice facility scoreboards to ''18.'' That's because the Celtics are hoping Horford can lead them to their 18th NBA title.