From Gary Washburn's twitter.
#Celtics team president of basketball operations Danny Ainge said team is not pressed to fill 15th spot, but PF/C is more of need than PG
— gary washburn (@GwashNBAGlobe) November 30, 2012
Obviously one of the key statement's here is that the C's are in no rush to fill the spot left by Darko, but it does signal which direction they are leaning in terms of personnel.
Now the question becomes, who? Reports from a while back were that the veterans on the team were pushing for Kenyon Martin, who obviously fits the bill as a PF/C type.
At the moment Doc is frustrated with the team's "softness" as well their awful rebounding. Martin would definitely help with the first part, he's known as one of the tougher dudes in the league. As for the 2nd, well that's more debatable. He averaged just 6.9 rebounds per 36 minutes last season with the Clips, and his career average of 8 boards per 36 is rather pedestrian for a big.