Kevin Grosskreutz has told former Germany teammate and Manchester United midfielder Bastian Schweinsteiger to join him at Stuttgart in January.

Schweinsteiger has been frozen out at United by Jose Mourinho, having yet to make a first-team appearance for the Premier League club this season.

Grosskreutz, meanwhile, is currently playing for German second-tier side Stuttgart, joining the club in January from Galatasaray.

"He's going through a difficult situation right now," Grosskreutz told Bild of Schweinsteiger. "But he's coping with it really well. He's invited to join VfB this winter. We'd all be happy."

Grosskreutz said after Germany's triumphant 2014 World Cup campaign that he and Schweinsteiger, who has since retired from international football, had become close.

Bastian Schweinsteiger has yet to play for Manchester United this season. Martin Rose/Bongarts/Getty Images

"We became friends during this tournament. He helped me from day one," Grosskreutz said after the tournament.

Former Bayern Munich midfielder Schweinsteiger is under contract at Old Trafford until 2018 and is reported to be due to earn around €20 million for the remainder of his deal.

Major League Soccer commissioner Don Garber has said Schweinsteiger would be welcomed "with open arms" in the United States, while U.S. coach Jurgen Klinsmann has said his arrival in the country would be "a great thing."