The defender charged over to Royal after the right-back slotted Spurs ahead.
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While many of Spurs’ stars celebrated conventionally by hugging Royal, Romero took a different approach.
The 24-year-old was caught by Sky cameras running over to Royal and jokingly booting him in the leg.
Richarlison also went for an unusual celebration, grabbing a handful of Royal’s shirt before the defender replied by putting his hand around Richarlison’s neck.
Royal and Romero then celebrated again by butting their heads against each other.
While the celebrations were all in good spirits, TV viewers were left stunned by Romero’s kick.
One wrote on Twitter: “Why did Romero just kick Emerson when celebrating. The guy is a menace.”
Another said: “Don’t know what’s worse playing against Romero or scoring for his team the way he just treated Royal.”
A third quipped: “Cristian Romero is the most nuts guy in the league. Did he just kick Emerson after he scored?”
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And a fourth joked: “Trying to understand why did Romero kick Emerson Royal during the celebration.”
Royal found the back of the net following a brilliant counter-attack by the home side, slotting home after being teed up by Ben Davies.
Son Heung-min then came off the bench to double Spurs’ lead and seal a 2-0 win.
Tottenham won the game without manager Antonio Conte in the dugout.
The Italian is currently recovering from gallbladder surgery.