Queens Park Rangers have reportedly informed Crystal Palace that they will only allow Jordon Mutch to move to Selhurst Park if they receive Fraizer Campbell in return.
The two London clubs are believed to have been locked in negotiations regarding midfielder Mutch's future over the last few days, with an initial £4m bid from Palace having been rejected.
However, the R's have now told Palace officials that they will sanction the deal, as long as Campbell heads in the opposite direction, according to the Daily Mail.
Mutch only joined QPR last summer for £5.5m from Cardiff City.