Sinclair signed a contract with the Eagles on Monday, Geoff Mosher of the Score reports.
Sinclair, who played his college ball at Missouri State, has yet to take a regular-season snap in the NFL. He provides plenty of size at 6-foot-7 and 270 pounds, but he could simply be a camp body while fellow tight ends Zach Ertz (undisclosed) and Richard Rodgers (upper body) nurse injuries.