LONDON, Sept 3 (Reuters) - Manchester United have signed Everton's powerful Belgium forward Marouane Fellaini for 27.5 million pounds ($42.80 million), the Merseyside club said on their website (www.evertonfc.com) on Monday. Fellaini, 25, was linked with a move to the Premier League champions throughout the transfer window although United's former Everton manager David Moyes left it late to finally land one of his main transfer targets. More...