"It's a gamble (selecting White), but it's one I'm prepared to take and I know she won't let me down."
In a squad whose average age is 25 and the caps per player averages out at 40, Powell will be taking several rookies to Finland.
America based goalkeeper Karen Bardsley, Leeds winger Clarke and Chelsea midfielder Buet have only a handful of caps between them.
"Dan and Jess are both a little bit raw," said Powell.
Powell defends Yankey Euro omission
"But that's sometimes not a bad thing and I think they'll bring something we need to the squad.
"We've been monitoring Karen for a time and the reports from her club have been very good. She has developed physically and she has a great presence."
Powell's team should go into the tournament with confidence having lost only one of their last 11 games, but the coach is remaining cautious.
"We had a really good run before Euro 2005 but then finished bottom of the group," said Powell.
"Sweden are the clear favourites to get out of the group, but we must respect all the teams we are up against and make sure our preparations are right."
England squad: Brown (Everton), Chamberlain (Chelsea), Bardsley (New York Sky Blue), A. Scott (Boston Breakers), Stoney (Chelsea), Johnson (Everton), Asante (New York Sky Blue), White (Arsenal), Unitt (Everton), Bassett (Arsenal), Williams (Everton), Carney (Chicago Red Stars), Chapman (Arsenal), J. Scott (Everton), S. Smith (Leeds Carnegie), Westwood (Everton), Buet (Chelsea), Clarke (Leeds Carnegie), K. Smith (Boston Breakers), Aluko (St Louis Athletica), Handley (Everton), Sanderson (Chelsea).
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