sources in spain suggest real madrid could sell gareth bale this summer .
the welsh winger is wanted by both manchester clubs and chelsea .
bale has a £ 75million release clause in his contract at the bernabeu .
real madrid are keen to sign borussia dortmund midfielder marco reus .
petr cech could join real if david de gea signs a new deal at old trafford .
liverpool may make a summer bid for aston villa striker christian benteke .
tottenham striker emmanuel adebayor is a target for french side monaco .
sam allardyce could manage abroad if he leaves west ham this summer .