Ten-man Arsenal hung on for a 0-0 draw at Leeds after club-record signing Nicolas Pepe was sent off in the 51st minute.
VAR officials spotted that Pepe had headbutted Ezgjan Alioski and referee Anthony Taylor took a quick look at the monitor before brandishing the red card.
Marcelo Bielsa's Leeds had been the better side even before the sending off with striker Patrick Bamford twice forcing Arsenal goalkeeper Bernd Leno into action.
Leno did well again to keep out a fierce drive from Stuart Dallas and then substitute Rodrigo crashed a shot against the bar from the edge of the area.
Leeds struck the woodwork twice in the latter stages with Bamford heading against the post and Raphinha also striking the upright deep in stoppage time.
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