Basically, Fulham sold CC to the developer for £50m, £15m of which was paid as a deposit to Fulham in Sept '02, £35m to be paid Sept '04.
Now that Fulham have decided to move back to CC, they must repay the £15m deposit already paid to them, plus interest which makes a grand total of £18.6m to be repaid to the developers by Al Fayed (and obviously they will not receive the remaining £35m).
Apparently Fulham had to rush the original deal through, because they were so desperate for a cash injection and no other investors could be found. Their accounts for 2002 showed a loss of over £40m, after losing £23m in 2001, and owed £125m, £100m of which is owed to Al Fayed.
So the bottom line is, to move back to CC, Fulham and Al Fayed must find £18.6m to pay back to the developers the sold the ground to for redevelopment, as well as having to spend at least £5m to bring CC up to Premiership standard.
Can they really afford NOT to sell Saha? I don't think so.