The transfer window became compulsory for European clubs in 2002/03 – and at that point, Sky Sports cyborg Jim White’s eyes snapped open as he awoke from his 3,000 years of cryosleep.
Of course, it took a while for it to become the exhausting circus that it is now. In Premier League terms, it was perhaps the arrival of a certain forward from Real Madrid to Manchester City for £32.5m in 2008. Or, two years before that, Argentina internationals Carlos Tevez and Javier Mascherano joining West Ham.
That jaw-dropping double swoop isn’t in this quiz as... well, did they ever actually sign properly for the Hammers, or was it some elaborate loan? We never quite figured it out – but the below were definitely, 100%, Jim White-screaming, summer deadline day signings. The 40 biggest up to today, no less.
We’ve given you the fee, the clubs involved and the player position. Eight minutes are on the clock – and we’d love it if you let us know how you got on @FourFourTwo (we’ll retweet the best scores, if you don’t give answers away). Then challenge some pals, why don't you?
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