Chelsea boss Claudio Ranieri believes the club must keep on buying if they are to fulfil Abramovich's ambition of becoming a match for Europe's elite. He said: 'We have signed very good players, but we need something more to compete with teams such as Manchester United, Arsenal, Juventus and Real Madrid. When I made the list, I just put the names. For me, signing the right players is more important than the cost and, of course, the big champions cost a lot.'