United and Spain goalkeeper De Gea has been frequently linked with Real, who he came close to joining in August 2015.
The following month he signed a new contract with the Red Devils that runs to the summer of 2019, with the option to extend for a further year.
That has not stopped speculation that Los Blancos will renew their efforts to sign the 27-year-old at the end of the season, but Mourinho has now moved to put off his former club.
Speaking ahead of United’s Champions League last-16 second leg against Sevilla on Tuesday night, the Portuguese tactician told Spanish TV channel La Sexta: ‘I see him (De Gea) staying here.
‘I do not know Real Madrid’s intentions but, if I were them, I would think of another player.’
England manager Gareth Southgate has claimed that the country needs to boot racism out of its own football before criticising World Cup hosts Russia.
Newcastle have been linked with a shock move for former Sunderland goalkeeper Simon Mignolet during the summer.