Aston Villa right-back Cash was tasked with keeping Mbappe quiet and he prepped for the challenge by watching video clips of the French forward.
That, however, could not prepare Cash for the real thing and he has admitted the 23-year-old was the toughest opponent heâs ever faced.
âI spent the afternoon watching his clips and I knew it was going to be a tough test, but when he gets the ball, stops and moves, heâs the quickest thing Iâve ever seen,â said Cash.
âIâm watching the videos while lying in bed! In real life heâs burning my legs, thatâs the difference. I got into a couple of races with him, and I did alright. You look over your shoulder and heâs there.
âHeâs obviously unbelievable and probably my toughest opponent by far. Heâs probably in the top two, three players in the world at the minute.
âI didnât know whether to drop off or go tight, and when I went tight he just spun in behind. I did everything I could, when it was one-on-one I thought Iâd done OK against him, he didnât really run me once.
âThere were times where he got space on the counter-attack which is where he scored the second goal, and thatâs where he hurts teams, but everyone saw tonight and in two, three, four years what he can do to teams, and he does that week-in, week-out.â
Cash knows plenty of the England squad given it is the country of his birth and he has played his whole career there.
The right-back knows they face a tough ask stopping Mbappe, but he believes Kyle Walker could catch the Frenchman in a foot race.
âThey donât need any tips,â said Cash. âI speak to [Jack] Grealish and [Declan] Rice a fair bit, because we play against each other every week, you always say hello.
âTheyâve got Kyle Walker who can play right-back and heâs just as quick as Mbappe! (Mbappe) is the quickest, [Raheem] Sterlingâs up there as well. I said before tonight that Sterling was my toughest opponent when we faced Manchester City, he was brilliant.â