Gerardo Martino criticised the absence of VAR from the Gold Cup after a "bad" refereeing performance almost cost Mexico in their nervy quarter-final win over Costa Rica.
El Tri squeezed into the final four thanks in large part to goalkeeper Guillermo Ochoa, who made a brilliant save deep into extra time and crucially denied Keysher Fuller in the subsequent penalty shoot-out.
The favourites might have avoided the fright had Panamanian match official John Pitti not awarded Costa Rica a second-half spot-kick for a seemingly fair Luis Rodriguez challenge on Joel Campbell that appeared to occur outside the box.