BOSTON — Shaquille O’Neal has changed The Big Three of the Boston Celtics into a Very Big Four.

The 7-foot-1, 325-pound center in the twilight of a brilliant career is coming to the Eastern Conference champions, hoping to add to his four NBA titles.

O’Neal signed a two-year contract worth about $3 million on Wednesday, a person with knowledge of the negotiations said on condition of anonymity because no details were released.

So this is where Shaq’s colorful career will end after 20 seasons if he completes his contract with the Celtics.

One of the NBA’s most charismatic players will finish with a legendary franchise on the parquet floor beneath 17 championship banners and the retired numbers of Bill Russell, Larry Bird, John Havlicek and other NBA greats.