Manchester United still hopes to reach an agreement with David De Gea on a new long-term contract that could earn him £ 350,000 per week, but there are concerns that agent demand is driving up the price of the deal, sources told ESPN FC.

United are ready to recognize De Gea's status as one of the best goalkeepers in the world by rewarding the Spanish international with a new five-year contract that would make him one of Old Trafford's highest-paid players.

The club expects to meet the salary expectations of 28-year-olds. However, it is frustrating that agents may not be available to their clients. De Gea has 18 months to sign up after United launched a one-year renewal option in November, which will keep him in the club until 2020.

United has signed new contracts this season with Luke Shaw, Anthony Martial, Chris Smalling, Phil Jones and Scott McTomayay. Although negotiations with De Gea have been ongoing for over a year, progress has been slow.

United is ready to offer De Gea, who came from Atletico Madrid in 2011, a salary package of GBP 350,000 per week – worth over GBP 90 million over five years – but no conditions have yet been agreed.

If an agreement can be reached, De Gea would be one of the best earners in the United States alongside Alexis Sanchez and Paul Pogba.

De Gea, who had seen a move to Real Madrid in 2015 and has been linked to relocations to Juventus and Paris Saint-Germain, is approaching the club with 350 missions while spending eight years in England.

He has been voted United Player of the Year in four of the last five seasons and won the FA Cup, EFL Cup, Europa League and 2013 title.