Unai Emery turned down the chance to sign Liverpool forward Mohamed Salah while at Paris Saint- Germain due to having concerns over the Egypt international.
The decision came while Salah was plying his trade at Roma, where he spent 12 months on loan and a further year on a permanent deal.
Salah went on to join Liverpool for a then club-record £36 million (€46m), which could rise by £7m due to a series of add-ons, and netted 44 times in his maiden campaign at Anfield.
That form has continued into the 2018-19 campaign, with the 26-year-old having found the net 15 times for the Reds, who lead the Premier League table at the halfway stage.