Juventus paid Genoa £22m for Romero in July 2019, but immediately sent him back on loan for the season.
He spent the following campaign at Atalanta, who paid a £3.4m loan fee.
On a bizarre day last August, Atalanta confirmed they had signed Romero permanently for £13.5m before sending him out on loan to Tottenham, who also secured the option to buy him for £47m.
The sums involved raised eyebrows, with Atalanta set to make a profit of £33.5m in a single season.