Austin Rivers on Celtics radar?

The Boston Celtics have been linked as a possible destination for Houston's disgruntled center Omer Asik, however they may not offer a good enough package to tempt the Rockets. One major stumbling block to any trade is the Celtics desire to remain under the luxury tax line this season. Currently they are just $134,098 below the threshold, so any trade will have to bring back less or even money.