When Benfica signed Enzo Fernandez for an initial £8.8m in June it was uncertain whether the River Plate midfielder would join the club immediately or in January.
It turned out the better question would have been when would he leave? The answer: Seven months later to Chelsea for more than 10 times that amount and as a World Cup winner and also the Premier League's most expensive signing.
Chelsea signed Fernandez on transfer deadline day for a record £107m (121m euros) after just half a season in Europe.
The 21-year-old Argentine's rise has been nothing short of meteoric since returning to River 18 months ago from a loan spell at Defensa y Justicia.