Nevin was happy with Billy Gilmour's impact for Scotland, but believes Havertz could be the real star of the tournament.
He wrote for chelseafc.com: "If there is an argument that Billy was going to be one of the breakthrough stars of the tournament, there is at least as big a shout for Havertz having an even bigger impact. In the Germans' second game against the much-fancied Portuguese, he was immense. His arriving in the box was timed to perfection time and again. His confidence alongside his renewed power, allied with that stunning ability, could help drive his entire nation to glory.
"To be fair, it would be remiss to ignore the impact of Toni Rudiger too. There are still people, usually pundits, who are unaware of his true qualities as a defender, but the man who was on a mission in Porto seems to have been given strict orders to carry on the same mission for this competition.
"It is an intriguing thought. Who are the most likely players to turn up at Cobham for pre-season training with not only with a Champions League medal round their necks, but also a Euros winners' medal?"