De Gea has been repeatedly linked with a move back to Spain.
Having come close to securing a switch to the Bernabeu in 2015, the former Atletico Madrid goalkeeper could finally exit Old Trafford this summer.
However, Mourinho is ready to drive a hard bargain for Madrid president Florentino Perez to land his top target.
Zinedine Zidane wants to replace Keylor Navas in goal and the La Liga giants have apparently already offered James Rodriguez or Isco for De Gea.
Jose Mourinho would allow David De Gea to join Real Madrid if he can land one of five targets there
Madrid are reluctant to let any of the five go this summer
But the Portuguese boss has been blunt in his snub of the proposals and is aiming bigger.
According to Spanish outlet Don Balon, Mourinho’s chosen stars are centre-half Raphael Varane, midfielders Casemiro, Luka Modric and Toni Kroos, and striker Karim Benzema.
Madrid are reluctant to let any of the five go this summer, but are being held to ransom by Manchester United.
The Red Devils are in a strong position with De Gea, who is contracted at the club until 2019.
Raphael Varane and Casemiro are two of Real Madrid stars Jose Mourinho wants at Manchester United
Real Madrid’s next No.1: Who will replace Keylor Navas this summer?
Fri, February 10, 2017
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Express Sport looks at the leading contenders to be the next first-choice goalkeeper at Real Madrid (odds provided by www.ladbrokes.com, correct as of 10/2/17)
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Who could replace Keylor Navas at Real Madrid in the summer?
Jose Mourinho has already rejected James Rodriguez and Isco for David De Gea
Should Madrid be willing to do business over any of Varane, Casemiro, Modric, Kroos or Benzema, Jose Mourinho would reportedly be prepared to close a deal.
If no agreement can be reached, it is claimed Perez will be forced to fork out just over £60million to lure De Gea away.
AC Milan keeper Gianluigi Donnarumma is on United’s radar amid his contract stand-off, although the 18-year-old has now suggested he wants to stay at the San Siro.