The Boston Celtics need a big man to replace Shaquille O'Neal (retirement) and Nenad Krstic (signed in Russia). The 2011 NBA Draft offers a perfect opportunity for Danny Ainge and company to find one, as the draft is littered with a number of high-potential big men expected to be available at the end of the first round.

The Celtics pick 25th on June 23rd and seem to be all set at the guard positions. Rajon Rondo, Ray Allen, and Delonte West all should be staples in their rotation again this season, and West can back up either position. The Celtics need help down low, as Kevin Garnett continues to age and Glen Davis' return remains in question.

One player the Celtics like is USC center Nikola Vucevic. ESPN's Chad Ford has Vucevic going at No. 23 to the Houston Rockets, but if the Rockets get a big man at No. 14, I don't see them taking Vucevic here.

Vucevic has already worked out for the Celtics in Waltham, MA.

If the Celtics are going to make one more (final?) run at the NBA title, they'll need some depth at the four and five. Here are five guys who I hope are up to the challenge.