A goalkeeping merry-go-round is set to unfold as either United or Chelsea stand to lose their first-choice stopper to Zinedine Zidane’s side.
Both David de Gea and Courtois are targets for the La Liga giants as Zidane looks to replace Keylor Navas.
But Courtois is the more likely to be heading to the Santiago Bernabeu in a deal worth close to £60million, according to The Sun.
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Should the Belgian leave, Chelsea will turn to Oblak, who has already held talks with United about a possible move.
Atletico Madrid will then look to replace the Slovenian with former Liverpool goalkeeper Pepe Reina, with Napoli moving for Arsenal goalkeeper Wojciech Szczesny, who has impressed during his time on loan in Serie A with Roma.