Manchester United have suffered yet another injury blow after goalkeeper David de Gea, who is on international duty with Spain, missed training on Friday due to a dislocated finger.

A Daily Mail report claims that the Red Devils star could be out for up to a month with his current injury, which will come as a big blow to Louis van Gaal, who already has to cope without a number of first-team players.

De Gea is set to remain with the Spain squad and have his injury assessed by their medical team, but is expected to miss both their games against Belarus and Germany.

"The keeper David de Gea was forced to stop training after suffering an injury to the fifth finger of his right hand," a statement said, as quoted by the Daily Mail.

"Having suffered a similar situation in the past, De Gea will remain with the squad and will wait to see how he improves."

The Spanish international has been one of United's best players this season and has featured in all 11 Premier League games and was even voted the club's Player of the Month in October for his top quality displays between the sticks.

Van Gaal is already missing a number of players, especially in the defensive department with players like Chris Smalling and Marcos Rojo still facing a lengthy spell on the sidelines. Apart from that, they have also lost Michael Carrick, who returned to action only recently with a groin injury during a training session with England.

However, there is light at the end of the tunnel after the Dutch manager revealed that a few of the injured stars like Radamel Falcao and Phil Jones could return for the clash against Arsenal following the international break.

With De Gea injured, the United manager will have to call upon Anders Lindegaard, who had been told he can leave in the summer or give a chance to youngster Ben Amos, who has been playing for the England U21 team.