Newcastle United boss Alan Pardew says just about every Premier League manager will be concerned about losing players in January.
Pardew knows several rivals are eyeing off his best players.
Asked if any manager could say a player was simply not for sale, he said: "I should think Mancini could probably say that and possibly Alex Ferguson, but no-one else.
"I hate the window. All managers, whether you are in the second division and you are losing a player to the first, or you have a top first division striker and you lose him to the Championship, we are all the same.
"We could lose our players to the Champions League teams, so you are all on your guard.
"Players start manoeuvring and agents - it's not a very nice period."