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Chelsea star Christian Pulisic came on for the injured Hakim Ziyech, as he came on in the first half to replace the injured Moroccan.
Pulisic has had his own hamstring worries since last season, and Chelsea boss Frank Lampard has slowly introduced him back to the team.
Pulisic ended up scoring the third goal that sealed the win for Chelsea against Leeds, and Lampard was very pleased with the performance of the American superstar.
Lampard said: “I was really pleased for Christian today because it has been a difficult period with the injury for him, when he gets frustrated in a good way because he wants to play.
“After playing 60-plus minutes in Seville I knew this game needed a huge amount of energy from the players so I felt the wise thing was to start him on the bench and to give him maybe 30 minutes.
“So for him to play the period of the game he played with the intensity of the game, and to get his goal, because he has the incredible gift of arriving in the box centrally as a wideman, I was delighted and he is only going to get stronger.”