By the looks of it, however, United may have their eye on yet another veteran central defender: former US international Oguchi Onyewu.
The out-of-contract Onyewu is visible in one of the team's Instagram posts from earlier this week – Onyewu's towering frame is hard to miss, even when pixelated – and sources confirmed to MLSsoccer.com earlier Thursday that the central defender is indeed training with the Black-and-Red.
United captain Boswell also confirmed the presence of the two-time World Cup veteran in D.C. camp on the latest episode of the Pitch Pass podcast.
It's not uncommon for a player based in Europe to train stateside in the offseason, though the case of Onyewu is made a bit more interesting by his local ties.
"Gooch" is a D.C. native, and has alluded to a potential homecoming with United, giving the idea that this is more of a trial than a training stint some legs.