It was not long ago that substituting forward Son Heung-min while chasing a winner was unthinkable for Tottenham.
However, in the 87th minute against Eintracht Frankfurt, a match the club's own announcer called the "most important game of the season", the South Korea international was taken off for teenage forward Mathys Tel.
The decision by manager Ange Postecoglou was entirely justified as the 32-year-old struggled to impact the game.
From the eye test this season, Son is simply not looking as quick or as sharp as before, therefore, is unable to make runs in behind defences or shift the ball half a yard to score.