I don't think it's likely they trade Pillar this year. He's under control for two more seasons, and he should be a solid CF for both of them. Nobody in the org is really pushing him out right now, since Pompey and Alford have been useless. I'd rather hold him than get a moderate prospect.
Solarte is also under control for 2019 and would be useful to keep around. He's not really having a great year so I'm not sure how much value he'd even have. He could be traded though, sure. I'd take a moderate prospect.