By Manchester correspondent Alex Stevens

Manchester United have offered David de Gea a staggering £250,000-a-week deal to try to keep him at Old Trafford, Football Insider sources understand.

Concern is growing at United that De Gea will return to Spain and join Real Madrid, either this summer or when his contract expires in a year’s time.

Louis van Gaal admitted on Friday that the Premier League club have made the goalkeeper a huge offer to persuade him to stay but so far there has been no breakthrough in negotiations.

“We have offered him a lot of money,” said Van Gaal. “It takes a long time now. So it can always happen. I want him to stay but I am not the boss. The player is the boss, he can say yes or no. You will have to ask David De Gea not me. He has to sign.”

Football Insider has learned that United have offered De Gea a basic package that would lift him into their top bracket of earners alongside Wayne Rooney, Robin van Persie, Angel di Maria and on-loan Radamel Falcao.

The deal is believed to be worth a basic £220,000-a-week plus top-up bonuses, which would make the Spain international the best-paid goalkeeper in the world. Rooney is United’s top earner, although his package only rockets to £300,000-a-week if all performance-related bonuses are triggered.

Tying De Gea down to an extended contract is a priority for United on the back of a season in which the 24-year-old has been one of the outstanding performers in the Premier League.

As revealed by Football Insider, United are hopeful that Phil Jones and Ashley Young, who are also out of contract in June 2016, will follow Chris Smalling’s lead this week and commit to new deals but they do not share that confidence with De Gea.

The sense within the Old Trafford corridors of power is that the goalkeeper will leave to replace Iker Casillas at the Bernabeu, either this summer or in 12 months’ time.

United would demand aroound £25m if Real try to sign him this year and Van Gaal has already prepared for the prospect of De Gea leaving as a free agent next year by bringing in former Barcelona keeper Victor Valdes.