According to The Independent, back in summer 2017, José Mourinho, training Manchester United back then, and fresh from his Europa League triumph, suggested Red Devils top brass not to go through with purchasing Dutch international centre-back Virgil Van Dijk from Southampton. Saints star backliner was purchased by Liverpool mid-season, on a £75m record sum (now broken by United themselves, though Harry Maguire's signing), and became one out of Premier League most valuable players, as well as key man for Reds winning last season Champions League.
Source: transfermarketweb.com