Tottenham suffered a huge blow early on in the north London derby after attacker Son-Heung min limped off with an injury in the first half.
The Spurs star appeared to pull up with a hamstring problem inside the first 20 minutes at the Emirates Stadium and had to be replaced.
The Tottenham physios came onto the pitch to give the South Korean treatment, but signalled that he could not continued with Erik Lamela coming off the bench in his place.
The severity of Son's injury is not yet known, but the fact he was able to walk off the field would have been an encouraging sign for Jose Mourinho.