Bill Walker, F, 6-6, Kansas State -- Might be a diamond in the rough if his knee problems are solved. Acquired in draft night deal for cash with Washington.

Semih Erden, C, 6-11, Turkey -- Tough inside player who has one year left on his Turkish League contract. A pick for the future.

BIGGEST NEEDS: The Celtics would like to solidify the center position. Kendrick Perkins is still their guy, but he missed Game 5 of the Finals with a left shoulder problem that has dogged him in the past. Even assuming he is fine, they'd like to be more certain of who backs him up. Scot Pollard had the job before injuries got to him. Then veteran P.J. Brown came in late and was tremendous. But will he retire?

FREE AGENT FOCUS: The Celtics didn't get to keep James Posey, but Tony Allen and Eddie House are staying. Patrick O'Bryant was signed as a backup center, but the club is still looking for a veteran in the P.J. Brown mold.

PLAYER NOTES:

--F Glen Davis has been the main spokesman for a new Celtics license plate. Proceeds from sales of the plate will go to charity.

--F Paul Pierce hosted a youth basketball camp in Boston the second week of July. In a nod to his new status, there were twice as many campers this year as last.

--G Sam Cassell has drawn free agent interest from Phoenix.