Shira Springer of the Boston Globe reports: On the first day that NBA teams can sign players to 10-day contracts, the Boston Celtics aren't going to waste anytime in signing someone to help their often injury-depleted roster.

Today, the Celtics will sign center/forward Mikki Moore to a 10-day contract today, expanding their roster to 13 players.

However, Grant Long was the Celtics' first choice until it was learned he had a broken left hand.

''We had a desire to bring in Grant Long, but Grant has a broken hand, so we are not going to sign a player with a broken hand,'' said coach Jim O'Brien. ''He's coming in to have our medical people examine the break and give us the best understanding as to when [he'll] be ready to play. We are in a situation where if Mikki Moore is the guy, then there will be no Grant Long.

''If Grant Long is able to play 20 days from now, and we don't think that what Mikki is giving us is [good enough], then we'll look at our options and they may or may not include Grant. My hope is that we don't have to be in a position to sign Grant, that Moore will be everything that we want, that he will be the guy that will be our 13th man. If Long was healthy, he would be coming in right now, but he's not, so we're bringing in the next-best thing.''

As for Moore, he had been playing with the NBDL's Roanoke Dazzle, and was widely regarded as the top player in the minor leagues this season. He was averaging 15.0 points per game, 7.9 rebounds, and 2.1 blocks for the Dazzle.

Forward Ruben Wolkowyski is likely to be the player that goes on the Injured list.