Even Davies, who has been in fine form since manager Owen Coyle took over at the Trotters in January, had given up any hope of making the national team and admitted he thought the news was a "wind-up" at first.
Tuesday's other quarterfinal tie pits 2008 runners-up Chelsea -- who have enjoyed an upturn in domestic form since sacking manager Andre Villas-Boas earlier this month -- against Portugal's Benfica , who lifted the European Cup twice in the 1960s.
He has been in sparkling form this season under new manager Carlo Ancelotti and his eight league goals have helped Chelsea take a two-point lead at the top of the Premier League.