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.

After receiving little interest from other teams, O'Neal will play on that floor with Paul Pierce, Kevin Garnett and Ray Allen, Boston's Big Three since Garnett and Allen arrived before the 2007-08 season

From the first pick in the 1992 draft out of Louisiana State to dominant, rim-rattling inside force to complementary player, O'Neal's NBA travels have taken him to six teams and 15 All-Star games. He is the fifth-leading scorer with 28,255 points and 14th in rebounds with 12,921 in league history. He's averaged 24.1 points, 11.0 rebounds and 2.3 blocks and was the NBA MVP in 2000.

His foul shooting might still be a problem and his lumbering style could slow down a running game, but the Celtics need the big center because Kendrick Perkins is out, possibly until February, following knee surgery. Perkins was hurt in Game 6 of the NBA finals against Los Angeles and missed the Lakers' 83-79 win in Game 7.

"If we get to another Game 7 down the line, I'm sure we will be glad we have Shaq on the team," Celtics co-owner Wyc Grousbeck said.

The team considered too old by some, despite nearly winning the title, has decided to rely for two more years on a group of 30-plus stars, all likely headed for the Hall of Fame.

O'Neal, 38, joins Pierce, 32, Garnett, 34, and Allen, 35. The Celtics also signed free agent center Jermaine O'Neal, 31 -- a six-time All-Star -- after the season.

All five are signed for two seasons, except Pierce, who has four years left on the deal he signed after the season. Point guard Rajon Rondo, 24, also is in the fold for four more years.

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