Courtois' age and history of recurring injuries have put the issue on the club's radar, even though there is currently no urgency to resolve his own future — unlike the situation with Vinícius Júnior, there are no signs of friction between the goalkeeper and the club over a new deal.
Courtois himself has acknowledged that Real Madrid ought to start planning for his eventual succession, and it appears to be an issue the Chamartín club are already working on behind the scenes as part of their broader goalkeeping strategy.
Trubin, 24, is well known to José Mourinho, who managed him at Benfica before taking the Real Madrid job this summer.
The Ukrainian goalkeeper produced one of the standout moments of this season's Champions League when he headed home a stoppage-time winner against Real Madrid in January, sealing Benfica's progression to the knockout play-offs at Madrid's expense — a goal that instantly went viral and made Trubin a household name well beyond Portugal.
Trubin is competing with Andriy Lunin — also of interest to Real Madrid in recent seasons — for the number one shirt in the Ukraine national team, underlining the goalkeeper's growing reputation. He has been tracked for some time for his shot-stopping ability and, above all, his long-term potential, with his level this season doing little to discourage suitors.
Should Real Madrid move for Trubin, it would represent a notable piece of business given his profile: a goalkeeper already performing at the top level for a Champions League regular, still only in his mid-twenties and with the kind of big-game pedigree that comes from beating Real Madrid on their own European stage.
For now, though, any move remains at the exploratory stage, with Courtois expected to retain his starting spot for the foreseeable future while Real Madrid continue to monitor the market for his eventual replacement.