Infact Bilbao offered him 5m in wages and he refused it.Now if suppose we hadnt tied him down with this good wages he'd be receiving,maybe he would've stalled the negotiations and invited some other clubs like Madrid,Bayern etc to make an offer for him who would've surely offered higher wages.
3.5m is what we offered him last summer when he had 1 year running on his contract.It surely had to be higher than this once he became a bosman.If you were well aware of the fact that bosmans work this way you shouldnt even be complaining in the first place.(Maybe not complaining but you still have problems over him getting that wage).
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We had to make sure we secure him thereby fending off interest from other top clubs,hence the high wages.In short.
In total he'd be costing us only around 22m.(0m transfer fee + wages of 4.5m *4 years).Very reasonable if you ask me.Especially considering he would've costed much higher last summer when you take transfer fee into account.