On May 13 Manchester City snatched the Premier League title away from rivals Manchester United after two late goals against Queens Park Rangers.
Six days later, Chelsea unexpectedly lifted the European Cup for the first time, after beating Bayern Munich in their own back yard - and Milner admits the confidence gained from such triumphs can rub off on England.
"Our players are going to the tournament high on confidence." said Milner at a press conference on Thursday ahead of England's friendly against Norway on Saturday.
"Players have had a taste and had a good season, others are at clubs that haven't won the Premier League or the Champions League but have had good seasons individually or positive seasons with their clubs. It's only a good thing for us as a team going out there to Poland."
Roy Hodgson, who was appointed as Fabio Capello's successor at the beginning of May, has selected four key players from each of City and Chelsea to join his 23-man squad ahead of Euro 2012 this summer.
City defender Joleon Lescott agrees with his teammate Milner and believes recent successes could prove beneficial for England's Euro 2012 bid.
"It can bode well for the country and the team, obviously coming in off the back of the Premier League title confidence will be high at the moment, and it will be the same for the Chelsea boys." said Lescott.
City won their title on the last day of the season with goals from Edin Dzeko and Sergio Aguero in injury time while Chelsea's Didier Drogba netted a late equaliser in the Champions League final against Bayern before winning on penalties.
"You'd like to think so, obviously you look back and gain from past experiences and the last game of the Premier League is one of those experiences I'd like to look back on and gain something from, and I'm sure it will be the same for the Chelsea boys."
Gareth Barry and Joe Hart complete the list of Manchester City players who will travel to Ukraine and Poland.