Roy Hodgson believes England must defend better if they are to succeed at Euro 2016, according to left-back Danny Rose.
Jamie Vardy's late winner sealed a 2-1 victory for England against Turkey in their opening warmup game on Sunday, after Hakan Calhanoglu cancelled out Harry Kane's opener, with Kane also missing a penalty.
England were vulnerable defensively throughout the match, however, and goalkeeper Joe Hart was forced into a fine late save to deny Olcay Sahan an equaliser.
"We're definitely optimistic, but the message from the manager was we have to defend better if we're going to go anywhere in the European Championship," Rose, one of five Tottenham players to start the match, said afterwards.
"We'll give ourselves a good platform to build on in the Euros."
Rose was named the sponsors' man of the match for a typical all-action performance down the left flank and the defender, who was winning on his third cap, admits it's "surreal" to be representing his country.
"Four months ago I wouldn't have thought I would be in this position. It's surreal," Rose said.
"I'm trying to enjoy every minute and take my club form into international level. Thanks to my teammates for helping me and making me feel comfortable.
"I'm thankful that I'm here. I had a good season at Spurs and that's down to my teammates and it's special for me to share this occasion with four Tottenham teammates and it helps."
Rose's Spurs teammates Kane and Dele Alli combined for the opening goal before the striker missed from the spot after Vardy was fouled.
Kane admits there is room for improvement but says the squad deserved to win at the City of Manchester Stadium.
"It's a positive start. It's a good win against a good side. Of course there's stuff we can work on, and we know that, but overall I thought we were the better team and we deserved the win," Kane said.
"Dele Alli's got another nutmeg which he seems to be doing a lot! It fell nicely to me and I was happy to put it in the back of net."
Hodgson started with Kane as the central striker in a 4-3-3 system, flanked by Vardy and Raheem Sterling but England switched to a 4-4-2 diamond in the second half, which appeared to suit the duo better.
Kane added: "It worked well. We've been working on a couple of systems in training and we switched midway through the second half to a different system.
"Whichever way the manager wants us to play, we'll play and we'll do it to the best of our ability."