Then they made some more moves on draft night, beginning with a trade involving the Dallas Mavericks.
Per Yahoo! Sports' Adrian Wojnarowski, the Celtics agreed to send the 16th overall pick in the draft and two 2014 second-rounders to the Dallas Mavericks for the rights to their No. 13 pick, Gonzaga center Kelly Olynyk.
And the C's were far from done, as they pulled off one of the most memorable blockbuster deals in NBA draft history, agreeing in principle to send Kevin Garnett, Paul Pierce and Jason Terry to the Brooklyn Nets for Gerald Wallace and three first-round draft picks, as reported by Wojnarowski.
It's difficult to identify the Celtics' needs at this stage, but they do bring in a promising new core of guys headed by Jeff Green, Avery Bradley and Jared Sullinger. With Rajon Rondo slated to return from his knee injury, the hope is that their stellar point guard has scouted his own team and come up with some plans for next year.
Name: Kelly Olynyk
Pick: No. 13 overall, First Round (from Dallas Mavericks)
Analysis: The Boston Celtics bolstered their frontcourt with Canadian seven-footer Kelly Olynyk.
After averaging 3.8 followed by 5.8 points per game in his first two years as a Bulldog, Olynyk flourished in his junior campaign. The young man from Kamloops, British Columbia posted 17.8 points on 63 percent shooting and 7.3 boards per game.
While he's slender for a center at 238 pounds, Olynyk could be a potent scoring pivot for years to come. Olynyk will join last year's first-rounders Sullinger and Fab Melo in Boston's emerging young frontcourt.
Getting To Know Kelly Olynyk
Name: Colton Iverson
Pick: No. 53 overall, Second Round (purchased from Indiana Pacers)
School: Colorado State
Analysis: The Celtics laid out some cash late in the draft to acquire Iverson. Not that Iverson, Colton Iverson.
The 7'0", 255-pound pivot blossomed at CSU in his final season after transferring from Minnesota. With the Rams, Iverson tallied 14.2 points per game on 59.6 percent shooting, also snagging 9.8 boards a night.
Colton, who sounds more like a football player, made his mark in the Mountain West tournament when he racked up 24 points and 16 rebounds in a tough loss to UNLV.
Perhaps Celtics prez Danny Ainge had his sights set on Iverson from the beginning, as he wasted little time in snatching him up and paid the bill in cash. Iverson provides size and the ability to knock down a jump shot, which is a continuing trend in the second round.
Getting To Know Colton Iverson