Tiredness not an excuse this summer.

England cannot use that old excuse.
Wilshere has yet to play this season, and will get match practice prior to the tournement starting so will be match fit.
Gibbs has only played 11 games, and as Englands best left back he should be fully ready for Euro 2012.
Alex Oxlade Chamberlain aka "the saviour" has only started 5 times, so is fresh and ready.

With Rooney getting 2 matches off to rest as well the Euros are in the bag for England, as all the other nations players will be tired out.
Plus Spain will again be without Messi, Holland have lost Ozyakup to Turkey and Germany look likely to miss the inspirational Mertesacker, so have no chance.

Glory for England is only 3 months away