Celtics.com has a brief update on the workouts that began in earnest today. Of note was the fact that Ainge has narrowed his list of players they are considering down to 6 players.
Ainge said he's focusing on six players for the #5 pick, and while he didn't provide an official list of names, Thornton and Brewer are likely two of the six given that they will stay for two days in Boston.
Steve Bulpett names the rest of the list:
The two [Brewer and Thronton] are among six prospects the Celtics have currently identified as possibilities at 5. Brandan Wright, Jeff Green, Yi Jianlian and Al Horford are the others.