article: Radamel Falcao's former Monaco team-mate Nabil Dirar believes the Colombian must be regretting his failed loan move to Manchester United even though he was not happy in France. The former Atletico Madrid striker moved to Old Trafford on a season-long loan  last summer but has struggled to hit the heights he achieved before suffering a serious knee injury. United will have to pay £46million to make Falcao's transfer permanent but having only scored four goals all season Louis van Gaal's side are unlikely to take up that option. Radamel Falcao has struggled for Manchester United during his season-long loan . Falcao has struggled to reach the heights he achieved before suffering a serious knee injury . And Dirar has revealed that Falcao was not happy in France but thinks he would have been better off staying at Monaco. 'I think Falcao must be biting his fingers [ruing the fact] he's gone,' he told Le Parisien. 'Here, he would have played and participated in the Champions League. But he may need more atmosphere. 'In Monaco, he was not feeling well.'
highlights: Radamel Falcao joined Manchester United on on loan last summer .
  Striker has only managed four goals in a disappointing season .
  Nabil Dirar said he would have been better off saying at Monaco .
  READ: Gareth Bale won't be sold to Man United, insists Zinedine Zidane .
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prediction: Radamel Falcao' s former Monaco team - mate Nabil Dirar 
   the Colombian must be 
   move 
   he was not happy in France 
   The 
   Atletico Madrid striker 
   Old 
   on 
   has 
   the 
   before 
   United will have to pay £ 46million to 
   Falcao has struggled for Manchester United 
   his season 
   long loan . 
   a serious knee injury . 
   would 
   been 
   at 
  