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Bastian Schweinsteiger could be ruled out for another month with a knee injury, according to reports.

The Manchester United midfielder suffered a tear in his right knee during the FA Cup third round win over Sheffield United three weeks ago, Sport 1 claims.

Schweinsteiger had an MRI scan in Germany, where national team doctor Hans-Wilhelm Muller-Wohlfahrt reportedly confirmed the injury was worse than it initially appeared.

When asked when Schweinsteiger would return to training on Friday, Louis van Gaal replied: "I cannot say.

"Every time I make a remark about injuries it is always difficult because injuries have developments and you have to wait and see."

"Also they have to train and be adapted to the rhythm of the Premier League which is high. When you are more weeks injured it takes more time to adapt to that rhythm."

READ MORE: Valdes aims parting shot at Van Gaal after making Liege debut

Marouane Fellaini has started the last four games in defensive midfield, however Michael Carrick is available again.

Despite concerns over Schweinsteiger's fitness upon his summer arrival from Bayern Munich, United's January draw at Newcastle was the first game the World Cup winner missed this season through injury.

Schweinsteiger could now miss United's Premier League home game against Stoke, the trips to Chelsea and Sunderland, both Europa League ties against Danish outfit Midtjylland and The Reds' fifth round FA Cup tie.

The 31-year-old might be available for Arsenal's visit on February 28.