David de Gea
De Gea could once again be at the centre of United and Madrid's transfer activityGetty Images

Paris Saint-Germain have joined Real Madrid in the race for Manchester United goalkeeper David de Gea in the summer, escalating speculation about his future. The Spaniard has been among United's best players this season and his departure would come as a massive blow for the Red Devils who are looking destined to miss out on Champions League football this season.

The Mirror reports that the Ligue 1 club are in the market for a shot-stopper and are willing to pay over the odds to sign De Gea who is likely to be pursued by Real yet again this season. The 25-year-old, who signed a new long-term contract last summer, is likely to be in the midst of another transfer battle in the upcoming window with his move to Madrid having broken down on deadline day in the summer.

United are expected to slap a £30m ($43m) fee on the keeper but De Gea has refused to comment on his future until after Euro 2016 where he will be representing Spain in France. Much will also depend on the managerial situation at Old Trafford with Louis van Gaal unlikely to stay beyond the end of the season. United are currently three points adrift of a top-four spot and have managed to force a quarter-final replay of the FA Cup against West Ham, which is ostensibly their best chance of winning a trophy this season.

Their progression in Europe has also suffered a massive setback, with the first leg of the Europa League against Liverpool at Anfield ending in a 2-0 loss for the Red Devils. Barring a miracle of epic proportions, Van Gaal's second season in Manchester is unlikely to reap any rich dividends, which could lead to his ouster.

Jose Mourinho is the prime candidate to replace Van Gaal in Manchester, with reports suggesting that he already has a gentleman's agreement with chief executive Ed Woodward. The Portuguese manager has himself revealed that he will be back in management in July, after the end of the season.