According to longtime NBA insider Chris Haynes Damian Lillard will not accept a trade to Boston. So if you were proposing the Celtics swap Jaylen Brown for the soon to be 33 year old point Blazers point guard, you can probably scratch that option off your list. I say probably since players have been known to change their minds. Also it's not uncommon for stars to try and leverage being traded to their first choice by saying they won't play elsewhere.
.@ChrisBHaynes immediately shoots down and laughs off hypothetical Dame Lillard to Boston trade on @dpshow
CH: “He’s not doing Boston.