State of Origin paranoia reached fever pitch on Tuesday night with NSW officials going to extraordinary lengths to ensure their final training session remained private.

Several Blues officials clad with walkie talkies scoured every nook and cranny of Etihad Stadium to weed out any potential spies in what was the team's final training run before Wednesday night's series opener.

A pair of fans clad in Queensland jumpers watching on from an empty bar were removed from the premises.

Media kept waiting for 40 minutes were also asked to leave after just a few minutes of the session, with coach Ricky Stuart desperate to keep his tactics behind closed doors.

A team spokesman said all players completed the session unscathed.