Manchester City chairman David Bernstein has confirmed that the £6m deal will only involve an initial payment of £3m. The final £3m will be based upon appearances.
Bernstein said: "It is all done bar the shouting. I'm delighted to say that we have been very successful in restructuring the payment.
"The deal we have now done is a lower figure overall with a smaller fixed fee and more based on appearances. The base fee is £3million with a further £3million based on a certain number of appearances."