The Belgian has spent the past three seasons with Atletico, helping them to win the Spanish Liga title last term.
Indications have been that Courtois will start next season with parent club, Chelsea. However, recent developments have encouraged Atletico directors to expect the Belgian to return again for preseason.
With Petr Cech set to stay on, it does appear Mourinho has settled on his keeper stocks for next season and is willing to send Courtois away on-loan again.
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