Getty Pittsburgh Steelers fans debated on social media the possibility of the team bringing back wide receiver Diontae Johnson. At the NFL trade deadline, there was some debate about whether the Pittsburgh Steelers should re-acquire wide receiver Diontae Johnson . But because of a little known league rule, the discussion was a moot point. NFL teams are not permitted to trade for a player they previously traded away for two years. However, the exception to that rule is if the player is placed on