The Boston Celtics have 12 players on full-time contracts at the moment. Because they are penny-pinching as much as they possibly can, they are waiting until the last possible second to fill in their last two roster spots in their hopes of staying under the luxury tax before the season ends.
An NBA team cannot go more than 14 days without having at least 14 players on its roster. Boston already danced around this by handing out 10-day contracts to Dalano Banton and John Tonje, but it's been almost 14 days since those contracts expired, and luckily, it's become pretty obvious who should occupy one of those spots: Ron Harper Jr.