Manchester United recently handed a new contract to David de Gea, but they are seemingly already concerned over his future.
The Mirror reports that United have already identified a long-term replacement for the Spanish goalkeeper, and are willing to pay £50million for his services.
Andre Onana is reportedly being targeted by the Red Devils over a potential move from Ajax.
The Dutch champions were braced for a summer exodus after selling Frenkie de Jong and Matthijs de Ligt.
The two departed for a combined £120m after guiding Ajax to a domestic double last season.
And now, they could be forced into letting go of Onana, too, with United reported to be ready to make a bid in January.
Only recently, United handed a new £350,000-per-week contract to De Gea to ward off any interest from Real Madrid.
The Spaniard had been close to agreeing a move to the Bernabeu in the past, only for a faulty fax machine to come in the way.
Instead, Madrid looked to Chelsea keeper Thibaut Courtois, who has failed to impress since making the £35m move to Spain.
He was at one point dropped by Zinedine Zidane and replaced by new signing Alphonse Areola, but has since regained his place in the team.
Still, Courtois has been less than impressive, and it is possible that Madrid will look again at De Gea, despite his new contract.
If they did, United have the insurance policy in place with Onana, who recently said he would be open for a move to the Premier League.