In the Euro qualifiers in 2015, England beat Lithuania 3-0 away and 4-0 at home.
But Iceland's stunning run last summer has clearly indicated that the gap is closing.
Midfielder Dier played the first half of England's defeat in Nice last June, as Roy Hodgson's side made a humiliating tournament exit.
Rooney's prospects of returning to the England set-up were placed in further doubt on Monday when he did not attend a meeting to which players in the squad and those hoping to force their way back in were invited.
"I like to go on a game-by-game basis". In all internationals now there's no really easy games. Every team sets up to try and stop us, especially here at Wembley. We want to play quick, exciting football and hopefully they won't be able to handle that. "That's the key, to play with intensity and to move the ball quickly".
"I think it's important that, when you look at clubs, sometimes the club captain isn't necessarily involved", said Manchester City goalkeeper Hart, who is on a season-long loan at Torino.
Dele Alli was impressive against Germany and could be one of the players to get their name on the scoresheet.
The England fans' behaviour was described by former Tottenham Hotspur manager David Pleat on the BBC as "pathetic ignorance" that was "scarring our reputation around the world".
"It's an ambition of mine". I would love to one day.
"It would be a real honour and I'd like to work towards it but that's something the manager decides". I don't think you can put this firmly at the door of the FA.
The England Supporters Travel Club is to withdraw the membership of any fans involved in anti-social, xenophobic or disrespectful behaviour on Wednesday and Southgate urged fans to remember that they represent their country when travelling overseas.
England's friendly defeat in Dortmund on Wednesday was marred by fans booing the German national anthem and singing distasteful songs.
Four people were killed during the attack outside the Houses of Parliament on Wednesday (23 March), including the assailant Khalid Masood, who was shot dead by armed police officers.
"If anyone would like to share footage or photos that they have taken or been passed from the match which shows supporters engaging in anti-social or unacceptable behaviour then please send this to [email protected]", the message continued.
"Whether I've been new, old or indifferent I appreciate coming into a squad is hard and the environment we try to create together is a positive one", said Hart.
"The part on our supporters is we have incredible support in terms of numbers and vocal support wherever we travel around the world, but it is also always important that they remember they are representing the country and we'd want them to do that in the right way", he said.