Willey has the distinction of being the only left-arm seamer in the frame, but he has slipped down the pecking order since Jofra Archer's emergence and may be considered a luxury given the pace bowling stocks at hand.
Moreover, Denly who was lined up as a utility option in the recently concluded series against Pakistan, has been dropped down from the final named squad.
Barbados-born quick Archer only qualified for England in March and has played just three one-day internationals for the host nation of the showpiece event.
Chairman of selectors, Ed Smith, said today the decision to include Archer had been "straightforward". "It was a very hard situation".
"It's a huge opportunity, we're looking to express ourselves and continue to play as we have in the last four years".
"I don't know the 15", Morgan told Sky Sports after the fifth ODI against Pakistan in Leeds.
"We had a conversation last night", Morgan said, "explaining the fact that there are nine group-stage games and the fact that we have four fast bowlers, and one of them is likely to get injured. And that's the route we've gone down with Liam Dawson".
For David Willey, he has a different opinion though.
Archer said his experiences in the Indian Premier League (IPL) with Rajasthan Royals will stand him in good stead for the intensity of a home World Cup.
While Denly will be sorely frustrated, he is a relative newcomer to the squad himself, unlike Willey.
Tournament hosts England unveil their squad for the one-day global showpiece on Tuesday.
"Our exceptional days are better than we could have imagined and I could never have seen those at the start of 2015". Still 100% behind the lads. He added that on "a positive" he was still winning at life.
But he has now made it into the 15-man World Cup squad that Smith unveiled at Lord's.
"He's very honest, dignified". He's a very good cricketer, very talented, a very exciting player.
Archer, whose father is English, only became eligible for England this year after a change to the ECB's rules in November. "We haven't had many injuries in the batting department for a long time, so we need to plan for everything, given that they might come into play straightaway, so they need to be prepared for that". For any team, knockout cricket is when the most pressure is.
Any suggestions that Archer's late arrival on the scene would disrupt the harmony of a winning team dissipated nearly immediately and the Sussex bowler already feels at home in the set-up.
"Everyone has welcomed me with open arms since I got in".
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