Adrian Wojnarowski just tweeted the following:

The Celtics continue intrigue with vet forward Mike Sweetney's comeback and will likely bring him to camp, sources tell Y! Sports.

Sweetney has fought weight issues and still needs to shed more pounds. Minny and Indiana also have interest.

I chalk this up as a no-lose "lets take a look at him" situation but the chances of him making the team are... wait for it... slim.