Chelsea want Belgian youngster Thibaut Courtois eventually to succeed Petr Cech as their No.1 but have failed in an initial bid to sign the Genk goalkeeper. The Blues will have to up their offer of £3.6million if they are to land the 19-year-old, who they would then loan straight back to Genk for next season. Chelsea are also rumoured to be chasing Courtois’ Genk team-mate Kevin de Bruyne who would be streamlined under the same kind of loan deal. Dirk Degraen Genk's director said Chelsea had been in contact over the proposed transfers, but reiterated that they could not be loaned to any other Belgium club particularly rivals Anderlecht. New manager Andres Villas-Boas has said there won't be major immediate transfer activity at Stamford Bridge while new staff get settled in to their new roles and become familiar with the current playing group. But securing youth looks to be priority after former sporting director at Chelsea Frank Arnesen began raiding the Blues academy after signing for new club Hamburg.