So Spurs pay £11m to Athletico then in reality they are only receiving £9.5m because we have had our money back. If we bid £9.5m + repay the £1.5m that I would suggest this puts us in a much better position and as such I am a lot more confident.
Athletico effectively have a £1.5m incentive to sell to us, look at it that way, But I am not surprised they are playing hardball as they know we want the player. Based on the above and if the player is neutral - WE ARE IN THE BOX SEATS.
In my role we get a fair few commercial issues where both sides are not prepared to budge on principle, but after a while the commercial reality of needing to get a deal done bites and both sides will give ground. If I was mediating this as a dispute I'd propose meeting in the middle. Saints pay £750k over the Spurs bid (leaving them £750k up), that way AM save face and retain more cash (£750k) than the Spurs deal.
PS if Sir Les is reading this and goes with my solution I expect a signed TA shirt.