LOS ANGELES — Doc Rivers is set to be introduced as the Clippers’ new head coach and vice president of basketball operations at a press conference here Wednesday.

And so ends, officially, Rivers’s nine-season tenure as the Celtics’ head coach.

And so begins, finally, after nearly two weeks of back-and-forth negotiations in which deals were dead and alive countless times, the Celtics’ head coaching search.

Challenges await them.

No. 1 is that the pool of candidates is rather shallow at this point, considering how many other teams — Phoenix, Denver, Detroit, Sacramento, Cleveland, Charlotte, Atlanta, Brooklyn, Milwaukee, Memphis, plus now the Clippers — have hired new head coaches. Full story for BostonGlobe.com subscribers.

Baxter Holmes can be reached at baxter.holmes@globe.com. Follow him on Twitter at @BaxterHolmes

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