Jose Mourinho is unhappy at how long Manchester United are taking to offer new contracts to his players.

Representatives of both Anthony Martial and Marcos Rojo held talks with United in December, but are still waiting for a proposal from the club more than two months later.

The two players are due to be out of contract at the end of next season — although United have an option to extend Martial’s deal by a further 12 months — and Mourinho is concerned about the delay.

Jose Mourinho is angry at how long Manchester United are taking to offer players new deals

Juan Mata, Ander Herrera, Luke Shaw, Ashley Young and Daley Blind also face an uncertain future after United recently triggered the one-year extensions on their contracts until 2019 without agreeing new deals.

The club’s failure to approach Marouane Fellaini with new terms sooner is understood to be one of the reasons why he has rejected the offer and now looks set to leave as a free agent in the summer.

Mourinho is worried that the situation will create ill feeling in a squad that includes big earners like Paul Pogba, Zlatan Ibrahimovic, Romelu Lukaku and Alexis Sanchez — who joined the club last month on a basic wage of £350,000 a week, rising to £600,000 when bonuses and image rights are included.

Martial and Rojo both earn in the region of £70,000 a week and have asked for a pay rise.

Anthony Martial's deal runs out at the end of next season but there is an option to extend

Defender Marcos Rojo earns in the region of £70,000 a week but has asked for a pay rise

However, their representatives have not had an offer from the club’s executive vice-chairman Ed Woodward or Matt Judge, head of corporate finance, the men who handle contract renewals.

Martial is said to feel under-valued by the delay in negotiations and has put off buying a new house until he has a clearer idea about his future. He also fears that the arrival of Sanchez could restrict his playing time.

Martial has attracted interest from Real Madrid, Tottenham and Arsenal in the past, although United have the option to extend his contract until 2020.

Rojo, 27, has been linked with a £30million move to Paris Saint-Germain as he enters the final 16 months of the five-year contract he signed when joining United for £16m from Sporting Lisbon in 2014.

Martial is one of six players facing an uncertain future at Old Trafford beyond the summer

Marouane Fellaini looks set to leave Manchester United as a free agent this summer

The Argentina defender’s combative style makes him a Mourinho favourite but he has missed the last four games through injury after returning to action in November following seven months out with a ruptured cruciate ligament.

Ibrahimovic has struggled to overcome a similar injury and is widely expected to leave United this summer.

Meanwhile, United do not expect any problems with David de Gea signing a new £220,000-a-week deal.

Goalkeeper De Gea is also under contract until 2019, with the option of another year, but the club held positive talks with his agent Jorge Mendes last month and are optimistic he will agree a new one.