London, Nov. 22 A fear of sweeping changes at Manchester United has not only senior players under scrutiny, but just everybody at the club.

Key players, including Nemanja Vidic, Michael Carrick, Ben Foster and Nani, are all working hard to prove their mettle.

As Manchester United boss Sir Alex Ferguson plans for the future of his squad, he has begun laying the groundwork for Serbian defender Vidic to leave next summer by routinely monitoring the form of Palermo defender Simon Kjaer, News of The World reports.

Ferguson is also convinced Northern Ireland international Jonny Evans, despite acknowledging his lack of pace will emerge as a top-class central defender alongside Rio Ferdinand.

Other players are also in the firing line, with Ferguson contemplating the futures of Carrick, Foster and motor mouth Nani.

Goalkeeper Foster's relationship with Ferguson reached breaking point following the 2-2 draw with Sunderland on October 3.

Nani is in danger for his incendiary comments. Despite his apology, the tricky winger is clearly in the danger-zone.

Former West Ham and Tottenham midfielder Carrick is also uncertain about his position, with old club Spurs retaining an interest in a deal involving Croatia star Luka Modric heading for Old Trafford.

Other positions being considered are at left back, where Ferguson wants an understudy to Patrice Evra. (ANI)