Answer
Besides José Mourinho, Carlo Ancelotti, Giovanni Trapattoni, Tomislav Ivić and Ernst Happel, Eric Gerets is the other manager to have won top domestic league championships in at least four countries. He won the Eredivisie with PSV Eindhoven, the Bundesliga with Borussia Mönchengladbach, the Ligue 1 with Paris Saint-Germain and the Süper Lig with Galatasaray.