Chelsea are lining up a move for Borussia Dortmund goalkeeper Gregor Kobel, who's also a target for Manchester United . Enzo Maresca wants to strengthen Chelsea's goalkeeping department, despite the Blues already having eight 'keepers on their books. Current No.1 Robert Sanchez has been at fault for a number of goals this season and although Maresca is publicly backing him , Chelsea's transfer team are actively looking for a replacement. Kobel, 27, has emerged as their ideal target, although