6. Zlatan Ibrahimovic (AC Milan to Paris Saint-Germain)
Age at time of transfer: 30
Price: £14.7m
The extravagant Swede has demanded a few big fees in his career and he was still valued at nearly £15m when PSG bought him in 2012. He has since repaid the French club with 106 goals in 126 matches.
5. Jeremy Mathieu (Valencia to Barcelona)
Age at time of transfer: 30
Price: £15.8m
This wily defender seemed a very un-Barcelona signing when Luis Enrique brought him to the Camp Nou last summer, but he helped the Catalan giants win an historic treble in the 2014-15 season.
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