Answer
Nzonzi's transfer fee to Sevilla was £7 million. This fee was significantly lower than the £25 million that Stoke City had paid for him just two years prior. The reduced fee was likely due to a combination of factors, including Nzonzi's age (he was 29 at the time of the transfer) and his desire to return to Spain, where he had previously played for Sevilla's rivals Real Betis.