Dwight McNeil and Brennan Johnson have swapped clubs [Getty Images]A rarely seen player swap deal has been completed between Premier League clubs. AdvertisementAdvertisement AdvertisementWhile such player trades between clubs are an unusual transfer window event, they are permitted - but they do have to meet certain rules. For example, Johnson cost Palace £35m, and his valuation as part of the McNeil deal would affect the Eagles' SCR calculations. If this is a true swap deal, and the two players are valued at £20m, that would be a £10m loss for Palace. The Premier League will make the final judgement on whether the deal passes FMV checks.