Liverpool forward Luis Diaz bravely stuck his head in to direct Joel Matip's long ball past onrushing Brighton goalkeeper Robert Sanchez, who then felled him with a raised leg into Diaz's midriff.
The Colombian was left floored and requiring treatment, with Liverpool's players unable to celebrate the goal, while the Video Assistant Referee Stuart Attwell checked for serious foul play, and then adjudged that there was none.
It left Liverpool fans angry and frustrated that Sanchez went unpunished. But here, former Premier League referee CHRIS FOY explains why the decision was correct.
The challenge by Brighton's keeper Robert Sanchez on Liverpool's Luis Diaz as the Colombian striker headed in the opening goal at the Amex Stadium is one, like many, that will provoke debate.