The realistic trade value for Rozier is a mid-late first round pick for 2019, conditional pick for 2020 or later, and/or solid veteran rotation player. His value might be higher if the Celtics were in a financial position to match any offer during the off-season. We all know that this can't happen unless Kyrie changes his mind about staying in Boston.
I suppose the Celtics could package a combination of Rozier and the potential 2019 picks that could convey. This would be Danny's best chance at acquiring a young talent or high level rotation player.