Playing a side managed by former Chelsea striker Andriy Shevchenko, England kept the ball and moved it well against opposition who came into this quarter-final off the back of a gruelling extra-time contest in their previous match, and they reaped the benefit as Ukraine wilted in the heat and England made the most of their substitutes.
Mount was one of two changes to the starting 11 made by Southgate, the other being Jadon Sancho, with the defence returning from a three to a four.
The Chelsea Player of the Year, who had missed the previous two games due to a period of isolation, had a mobile role behind the three forwards, and played his part defensively and in attacking moves.